I already emailed Ross about this, but I figured I'd join up to the forum to share this.
I'm a huge SEGA fan, and one of my favorite series from them is Jet Set Radio. Partly because it has fantastic soundtracks.
The issue is, while the main Naganuma soundtrack is easy enough to find, the WHOLE soundtrack is a little trickier.
So here's a link to a zip archive I made of the entire soundtracks to Jet Set Radio, Jet Set Radio Future, and spiritual spin-off, Oliie King.
Every track is there, ordered and ready to go. Hideki Naganuma, Richard Jacques, Cibo Matto, Deavid Soul, Rob Zombie, Jurassic 5, the Latch Brothers, Russel Simms, everyone, plus official album art, and as a bonus, some songs that are edited or remixed for the games have the original songs included.
EDIT: Didn't realize I was posting an encrypted file. Fixed the link, should be good to download now.