It replaces the standard firmware (operating system) on a number of portable Digital Audio Players, and supports FLAC, Shorten, Ogg, MP3, AAC, WAVPack, WAV, AIFF audio formats and a bunch more. Having all these supported on one device is excellent. It also does gapless playback and all the other things you'd expect of a decent digital audio player.

Your machine isn't supported though Archos devices that are are: Archos Jukebox 5000, 6000, Studio, Recorder, FM Recorder, Recorder V2 and Ondio

Check http://www.rockbox.org/ for more details.

Archopen might be worth looking at. They're doing a similar thing with some newer Archos devices: http://www.archopen.org/tiki-index.php