I recently just downloaded the Demo Version of this game, and even though it's very limited, it still gets me excited for this game.
http://www.spore.com/http://media.pc.ign.com/media/735/735340/imgs_1.htmlIt's coming out for the PC as well as the DS. It looks like a lot of fun. You start out as a single-cell organism, and grow into a bigger creature. You can then team up with other online players to take down bigger creatures. Not everything has been revealed for this upcoming game yet, so I don't know that much about it, but I recommend downloading the Demo Creature Creator to just get a taste of it.