Good news! Jet Set Radio (AKA Jet Grind Radio in North America) has been released by SEGA onto the Steam platform! This happened on September 19th (four days before this article) but I must have missed it. Oh, well :) Downloading now.
Jet Set Radio was one of my favourite games on the Sega Dreamcast. It pioneered the use of cel shaded graphics in games and really showed off the console's graphical power. Plus, it had a kicking soundtrack that I listen to still to this day.
I'm looking forward to playing through Jet Set Radio again, this time on PC.