Idea:
Automatically determine BPM (beats per minute) and store the result that is compatible with Itunes.
BPM.
THis is already on the wishlist, to be honest I have no idea how to do this, but if there was a library that already did this I could plug it into Jaikoz quite easily
Well, I don’t know much about developing software, but I found out some information that is specifically for software developers, so maybe it can be of some use, or maybe not 
BpmDJ (open source Linux)
GJay (open source Linux + X)
Builds a GUI around BpmDj.
Creates playlists.
Does not store information in the MP3 tag.
Okay, thanks for the research.
Unfortunately this is Windows only, I need a cross plattform (prefereably Java) library