Sega released the Dreamcast Collection on Xbox 360 a while back with XBLA ports of Crazy Taxi and Sonic Adventure also with Space Channel 5 Part 2 and Sega Bass Fishing. The latter two haven’t come out on XBLA but Sega assures that it’s coming in the late summer after missing the initial early 2011 release. No price announced but Sonic and Taxi were both 800 MSP when released.

Source: Joystiq