It will be hard to emulate Dreamcast on the Xbox though, sure the Xbox has enough power but their isnt even a Dreamcast emualtor for the pc yet. Personally I think it would be pointless to have a Dreamcast emulator becuase it wouldnt beable to read Original games and you would have to reburn all of your Illegal and Legal backups to CDRW's unless you did the Pot Tweak or have a Samsung dvd rom drive in your Xbox.
And we already have all kinds of Sequels and Remakes of Dreamcast games out on Xbox. Like:
*House of the Dead 3 (W/ House of the Dead 2 port)
*Sega GT 2002
*All of the Sega Sports games except for Sega Tennis.
*Jet Set Radio Future
*ToeJam & Earl 3 (Canceled Dreamcast Game)
*Crazy Taxi 3 (All levels and characters from 1,2,and NEW 3)
See at this point of time I think it wouldnt be worth havin a Dreamcast emulator on the Xbox...........
HeHeHe though....I would like to be playin Power Stone on my Xbox though, that would be TiGhT.