Stuff of the show (so far) for me:

SSX - didn't show much but i've been waiting for a new one for a long time. Best chill game ever.
AC: Revelations - Love the AC games, can't wait to wrap up the Ezio story
Kinect tech demo stuff - interested in the possibilities of scanning real world items into a game and 3d space drawing. could make for some great puzzle games.
Vita at $249 - I had NO interest until i saw that price. now, even if i just use it to watch movies (OLED) it'd be worth it to me.