EA announced at Macworld that they would be releasing Spore later this year simultaneously for PC and Mac.
Spore is your own personal universe in a box. In this universe you can create and evolve life, establish tribes, build civilizations and even sculpt entire worlds. In Spore you have a variety of creation tools at your disposal that allow you to customize nearly aspect of your universe: creatures, vehicles, buildings, and even spaceships. While Spore is a single player game, your creations and other players' creations are automatically shared between your galaxy and theirs, providing a limitless number of worlds to explore and play.
Spore will use TransGaming's technology to allow EA to quickly make a Mac version of the game:
"The technology wrapper goes around (the software), and traps the (code) calls native to the Windows environment, and converts them to the correct calls for Mac," McCombe said. "It's not a complete code rewrite. It's more wrapper technology with some customer work."
The official site has more information, screenshots and movies.