Spore, the game!

You think Google Earth is cool? Well, get ready to be blown away by Spore, a PC game by Will Wright, creator of The Sims and Sim City.
I'm not sure what kind of cpu power this game will require, but you pretty much create and affect every single element within a galaxy and let time happen through "procedural" content development.
The magnitude of this game is ridiculous and you feel like a god of a god! Check out the video of Will presenting Spore at the 2005 Game Developer's Conference!

Google Video of Spore
GameSpy Article