So apparently Project Natal will be called "Kinect". That sounds pretty bad to me, although not as bad as "PlayStation Move". Some games under development for it:
Kinectimals - Train and play with 20 virtual cats, including a lion, tiger, and cheetah.
Joyride - Originally supposed to be a free Xbox Live Arcade game that used Avatars, it seems to control like the racing demo from E3 2009.
Kinect Sports - Basically a clone of Wii Sports. Sports include boxing, bowling, beach volleyball, track and field, soccer and table tennis.
Kinect Adventures - A river-raft time trial and obstacle course, playable by up to four players
Dance Central - Described as basically being So You Think You Can Dance, it's being developed by MTV Games.
Microsoft is also working with LucasArts on a Star Wars game and Disney on a game featuring iconic Disney characters.