[quote name='Vinny']SC and SoA are two of the best DC games there is.
Sonic Adventure is pretty good and so is Chu Chu Rocket. Jet Set Radio and Crazy Taxi are great if you haven't played the ports/sequels on the other systems.[/QUOTE]
AFAIK, Jet Set Radio wasn't ported to another system. A sequel came out on the XBox called Jet Set Radio Future (JSRF), and is excellant. Infact if you played JSR, the beginning to JSRF will intrigue you.
Bottom line is, get JSR for the Dreamcast. It is plentiful, cheap, and a great game. If you have an XBox checkout the sequel too, as it is also plentiful, cheap, and good.