It features a file browser, full skin support, smart shuffle and repeat modes, a 10-band equalizer with preset support (8 included presets), built-in sleep mode, a blank screen command to prevent energy waste while playing music and many more new features. Nitrogen uses the MAD/OVD decoders, which are opensource. As the official releases of MAD for Pocket PC seem to be discontinued, Nitrogen uses the libraries from an opensource player (GSPlayer).

Nitrogen was build due to the lack of finger-friendly players for Pocket PC (you have to use stylus even for simple tasks). It features large buttons and you can browse among your playlist by drawing circles on the screen (using skins which support wheel component). In future releases the program will be expected to have other extensions support and more features, but such things are still being tested to ensure stability and efficiency.

Key features:
- Full MP3/OGG playback.
- Customizable interface with skin support.
- 10-band equalizer with 8 presets.
- Large and easy-to-use buttons.
- Media browser with playlist editor.
- Large menus to perform tasks with the fingers.
- Kinetic scrolling.
- Smart shuffle and repeat modes.
- Adjustable sleep timer.
- Amazingly fast to load and to play.
- Blank screen command to save energy.
- Native C++ code: no need for .NET framework.
- Extremely lightweight.
- File association support.
- Album art support.
- Opensource.

Now with many new features: file association, kinetic scrolling, ID3 tag support, bugfixes, built-in equalizer presets, long-tap functions, sensible shuffle mode and much more!

Tip:
Many features are now accessible through long-tap (tapping and holding for a while): fast-forward and rewind, advanced playlist actions and so on!

Download Skin Toolbox for Nitrogen 0.3 / 1.0 (Win32) v1.0.1 here (952 KB) or its mirror here and post them in the skins page!

Screenshots:

If you like this tool/game, please consider donate to the developer.

SOURCE

http://forum.xda-developers.com/showthread.php?p=3914093

Reviews:

***** [Feb 19, 2009] by earthshaker using htc diamond
Wow, it's been some time I've been looking for something like this. This player has intuitive interface that allows good mp3 playback. Btw, there's a new version on the developer site (v0.3) with some improvements. The only thing I don't know is why is such a nice player on the "utilities" category on freewareppc instead of "audio"?

*** [Jan 31, 2009] by Heirophant using Acer n310
VGA version looks nice but not much use on the move since you can't use the hardware buttons to control it. I like to be able to control mp3 players by feel without taking the device out of my pocket, and although you can use the joystick for this with Nitrogen, I find the joystick is too easily jogged leading to random track changes. Also the media browser is rather clunky, you can only see a few files at a time. For now I'm sticking with GSPlayer which has programmable keys.