I was surprised that I couldn't find mention of this anywhere so here goes...
Stone Oakvalley's Amiga Music Collection
(or SOAMC= for short) is a project to "preserve Amiga music in todays most common music format, namely the MP3". It is scheduled to go live in October 2008 with 115338 MP3s of classic Amiga tunes and in the meantime they've decided to give everyone a little taste of the what they're up to by making available the first 33036 MP3s. Definitely worth checking out!
P.S. Cute URL.