AVR-Chat

Hi there;

I am considering embarking on a new AVR project: an MP3 player.  I was
thinking of basing it on the yampp mp3 player ( http://www.yampp.com )
but somewhat modified.  One of the mods I want to do is use a "normal"
filesystem on the CF card to make it easier to move the files around
instead of yadl (Yampp Advanced Disk Layout).  What I was wondering is
if there were any stores of freely available AVR fat16/32 C source code
I can check out to learn how to do it.  

I figure that with building my own MP3 player I can actually get one
that works the way I like!

Craig