Zauri, the sample space shooter game demoed today, uses the Zunepad, thus wouldn't work (as well) on a Zune 30.

ENGADGET: Games for Zune details, hands-on

This will be an update of a first-person shooter game with a plot that revolves around battling mutant humans attacking from outer space - very similar to the aliens in the Halo series.

BBC: Halo 3 character