I love how we've all judged the unreleased Sonic Adventure port. I'm not saying it wont be a terrible port, but Sega has put unfinished versions of games on Partner Net many times before, Ikaruga was on there almost a year before it was finally released, and it was a broken, shoddy version that couldn't be finished.
I have hope, that is Sega is working on porting more Dreamcast games to PSN and 360 (as the leaked memo said they would, and their new digital distribution focus would seem to indicate) then they will get the treatment they deserve.
Please, don't just try and develop a "one size fits all" emulator and then start shovelling Dreamcast games onto it like you did with the Mega Drive/Genesis XBLA ports. Something like Jet Set Radio deserves so much more. I'm not asking for a remake, just a nice HD rendering version with a solid framerate like Rez HD and Virtual On.