I've got two different wrap around bluetooth headsets. Insignia's from Best Buy, and Wireless Gear from Target (possibly discontinued). Both $50. Very convenient, yet neither do low frequencies very well. Both are better sounding than any of the earbuds. 
My wired headphones include Sony CD30, Sony MDR-V150, JVC HA-NC80 Noise Cancelling, Maxell NC-11 Noise Cancelling, Philips SBC HN110/37, and Sennheiser 595s.
Three are noise cancelling. Of these the Philips HN110s are the best. Second comes the Maxell NC-11s, and the weakest is the JVC NC-80s. The Sony CD30s are my oldest pair and also the worst of the bunch. Sony's V150s are next. Both suffer from very poor bass reproduction. My top three are the Philips, Sennheiser, and the Maxell in that order. Sound reproduction is amazing in both the Philips and Senns. Two reasons I rated the Philips higher is because they were 1/3 the price of the Sennheisers and include noise cancelling that does an excellent job of cancelling background noise.The last of my collection is the Sony DR-BT50 Bluetooth headphones.
Smaller than they appear in photos you'll find on the web, the BT50s don't quite surround my ears. Sound quality from my Samsung P2 is easily as good as from the Philips wired headphones. The Sennheisers completely cover my ears, and are more comfortable, but the Sonys are far more convenient. With no apparent loss in sound quality over the best of my wired headphones, no wires to contend with, and remote control of the player directly from the headphone, the Sony DR-BT50s win my vote as the best headphones in my collection. Just like all my bluetooth headphones they have volume control, FF/RW, Play/Pause, and will also pair with any bluetooth cell phone. Sony throws in an additional Folder +/- command, although none of my bluetooth players utilize it.My top ten list, beginning with the best:
1. Sony DR-BT50
2. (tie) Sennheiser 595 and Philips SBC HN110/37
4. Maxell NC-11
5. JVC NC-80
6. Sony MDR-V150
7. Sony CD30
8. Insignia NS-BTHDP
9. Wireless Gear 4PR918
10. Zune 80 earbuds.
The Best value in a wired headphone goes to the Philips SBC HN110/37. With noise cancelling, a comfortable fit, and a low price they win hands down.
The Best value in a Bluetooth headset goes to the Sony DR-BT50. Yes, it's 3 times more expensive than the other two contenders. Far superior sound quality and comfort makes it a better bargain, though.
There are hundreds if not thousands of other headphones out there to choose from. My list is only from the headphones I've actually listened to and compared. I'd love to hear what headphones you prefer. Please leave a comment.
4D
I like to spend time with a new product before I get into a critical evaluation of it's features. I've had my X1051 for about two weeks now, and am only just starting to find it's secrets out. This is no simple device, although it may seem that way on the surface. Here are basic specs, borrowed from 
The now-playing screen is full of information. You'll see the album art (although not full screen width), Song title, Artist, Album, play mode, and a position indicator all in a quick glance at the screen. Nice icons aside the items help distinguish them. 
Music will continue to play after leaving the music app, so you can listen while perusing photos or the web. The OLED screen makes viewing whatever is on the screen very easy from any angle. A nice surprise compared to the LCD screens many other players use. The Music app is a pleasure to use on this Sony. It exploits album art with a choice of list or array views showing covers, and a flashy vertical 3D-ish album slide right from the Now Playing screen. 
Video: Two BIG strikes against video on this Sony are the limited codec support and limited resolution support. When something does play it looks great on the OLED screen. With a limit of 262,144 colors (compared to 16 million on the Cowon S9's AMOLED screen) you may see some blockiness depending on the video. The X1051 comes with three demo videos on board, each at 432 x 240 in WMV format. The user manual implies it will play videos up to 480 x 270, but of course the standard size (many other players support) is 480 x 272, or in other words two pixel rows beyond what the Sony plays. Speaking of the user manual (found on the included CD), it appears it was cut and pasted from Sony's other players as 320 x 240 pixels seems to be the best it can support in any other format. That just happens to be the resolution every previous Walkman's screen was limited to. I threw a 320 x 240 WMV file on and it did play. You can have the video stretch to fill the larger screen if you choose. No dropped frames. Audio stayed in-sync with the video. I have no doubt this Walkman is a competent video player, yet it's limited resolution support means a whole new round of down-conversion will be required if you own larger videos already. There are dozens of players out there with larger screens and better video playback, so I can't recommend this Sony if that's your major reason for purchasing one. Windows media player 11 managed to convert one of my larger WMV videos to a smaller resolution that does play on the X1051. It took 7 hours. Not good. The nicest feature in the video app is that it lets you delete (non-playable) videos from the player. 
Photo: Here's another place where Sony seems to have gone only half-way. Photos will display on the screen, and apparently auto-rotate to best fit, then expand or shrink to bump the screen edge(s). You can easily flick between photos. No Zoom I could find. No manual rotating of images. No slide show feature I could find, although there may be one hidden in the settings. You can use a photo as a wallpaper for the home screen at least. Yes, this Sony will display your photos. They'll look great on the OLED screen as seen above. That's about it though. 
Podcast: This is one place the Sony excels. With WiFi connected, you can choose and subscribe to podcasts right on the player. Once subscribed to the player will download the latest episode for your listening pleasure. Not every podcast works, as I found one that refused to play, but when they do it is very, VERY convenient. I have several podcasts I listen to regularly, yet don't bother putting them on any other player. It requires first downloading them to my PC then copying them to the player. They are simply easier to listen to on my PC. I don't need my PC on to get updated podcasts uploaded to the Sony. The Sony manages podcasts on it's own and eliminates that PC step! One major thing it doesn't seem to manage is video podcasts. I've also had no luck figuring out how to add podcasts that aren't listed within the podcast web list. A search option would also help find podcasts you already know about.
Noise Cancelling: This is a useful feature. It works only with the included earbuds. There is an on-off switch for noise cancelling on the side of the player. There is an icon/app dedicated to noise cancelling on the home menu. You can choose one of three environments (Bus/train, Airplane, or Office) for noise cancelling. Using the included external line-in cable this player can also serve as a noise cancelling pass-through for other devices. In the settings menu you can set the noise cancelling level to anywhere from -15 to +15, although I'm not sure what that scale relates to. With mine set to 9 and the switch ON while in Office mode, I find noise cancelling works almost perfectly. Where I sit typing this there is a cacophony of sounds. The PC's fan whirs. The keyboard clicks. My chair squeaks. The house air conditioner blows. The phone rings. Yet with noise cancelling in play I hear only my music. Sublime.
Conclusion: It's a great music player. Your music listening experience can't get much better than this. If you enjoy podcasts on-the-go then you NEED this player. Looking for a pocket video player? Skip this one. Need a PDA? This isn't it. Wishing for some games? Keep wishing. I'm conflicted by this widescreen Walkman. It has a couple of capabilites that no other player I have has. It costs more than an 
Included: The S9 comes with a USB cable and earbuds with pads. The USB cable is proprietary, although my S9 also works with the cable that came with my iriver SPINN. Replacements for the included charging/data cable shouldn't be hard to find. 
The 
You get a small CD which includes the JetEffect media player/sync application. There is also an array of paperwork including the User Manual, Cowon's Warranty Policy, Russian and Korean registration cards, and an offer from eMusic for 35 free songs + 1 free Audiobook. 
Controls: The top edge reveals a volume +/- rocker, Play/Pause button, and FWD/REV rocker. A power/hold slider is on the bottom edge beside the 3.5mm headphone and data cable jacks. There is a microphone and reset hole on the back. The top mounted controls make sense if the S9 is in your pocket, but are a little hard to reach when holding the S9 naturally.
- There is no way to clear icons off the screen so you can see a photo unobstructed! The Pictures app still needs work. With such a great screen the S9 should allow unobstructed photo viewing. B-
Included in the box is a Quick Guide, Software CD, Warranty booklet, Headphones with pads, Data Cable, and a stylus. 
The Data Cable is proprietary. Plugged into your PC you are presented with three options: Power and Data, Power and Music, or only Power.
One nice thing about the touchscreen is that you can touch it with your finger or a stylus. A simple aluminum (I think) stylus is included. 
Dimensions are 0.53" thick by 4.44" wide by 2.9" tall. It weighs 174 grams or 6.1 ounces. For comparison my 
UI. Turned on you are presented with "designed by iriver" as the Operating System loads up. No icons on this touchscreen. The home page is like a contemporary magazine contents page. Each application has it's own section of the screen. Music displays the album art of the last or current song playing. Photo is the last one you viewed. If there was art with the movie you last watched it'll display in the video section. You'll see the last radio channel listened to, and in the document section you get a snippet of the last text you viewed. 
I have to admit that I was not overly impressed the first time I turned on the P7. It's not obvious what to do, but touching any area on the screen invariably opens an application. Touch the album cover art and you'll find yourself in the music application. The upper most level gives you the choice of Now Playing, Quick List, All Music, Artists, Genres, "My Playlist", and "My Rating" to sort your music by. Quick list is basically a playlist you can create as you browse through your songs.
Video playback is also right to the point and excellent. Formats include AVI, WMV, MP4, RM.RV, DAT/MPG, 3GP/K3G, and FLV. The video app remembers where you are within any video previously played. You can stretch video to fill the whole screen. The expected skip back/forward and play/pause are there. You also get the same bookmarking options the music app had. The submenu has Ratio, Video Option, and Subtitles, with Scan Speed and Play mode under Video Option. I've tested MP4, AVI, and WMV files on my P7. All played fine. The only negative thing I can find about video play on the P7 is related to the screen technology used. The AMOLED screen of the 
Recording is straight forward and versatile. Tap the red circle on the home screen and you're in the recording app. The submenu lets you pick from 3 quality settings including 64, 96, and 128Kbps WMA. The mic is on the right end of the P7, and I got the best recording if I talked directly into it or at least tilted the P7 so the right end was toward me. Once you have a recording or two you can play them directly from the recording app. Your list of recordings is revealed if you slide the screen from right to left. 
Radio. Nothing special here. The P7 FM Radio app won't bother doing anything until you plug in some headphones (antenna), and actually reminds you to. Once plugged in, you can manually tune or have the P7 automatically scan for and create a preset list of available channels. No RDS. You can record from FM, and choose from three different quality settings. There is no scheduled record. Competent, but not extraordinary. 
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