Dubb'd the 'Ypod'. The YAMPP mp3 player is the pinnacle of many DIY mp3 player projects combined. It uses all off-the-shelf components, you just need a fab'd PCB board. The entire project is open-source, hardware and software so go take a look!
PyroFactor: 
October 2nd, 2009 at 3:50 am
The software looks sluggish any other open source alternatives??