Slaugh...err...Herd Animals with a Friend in Flock
One of the games that sort of went under the radar at E3 was a little title from Capcom called Flock. The games developers have a resume that include such titles as Lemmings and Crackdown, and in a sort of twisted way share some characteristics of both games. The basic gameplay is much like a Lemmings game, use your UFO to guide sheep, pigs, and cows through a maze like obstacial course to the Mother Flocker (that's your big herding ship). Flock promises to have plenty of physics based puzzles as well as a 2-player co-op mode.