Now I'm not sure how many people would want to know, but I did this last year so here it is (it's not really in chronological order, it's just the way I remember them):
>Beatles Rock Band shown (Paul McCartney and Ringo Starr appeared) - trailers only
>Tony Hawk Ride shown by Tony Hawk (who else?) - trailers only
>Modern Warfare 2 shown - demoed (looked great)
>Final Fantasy XIII shown on 360 - demoed
>Shadow Complex annouced, developed by Epic Games - demoed
>Joy Ride - trailer (announced as FREE)
>Crackdown 2 trailer shown
>Left 4 Dead 2 trailer shown (YAY!) - announced for November release
>Splinter Cell Conviction shown - demoed (looks totally different to before)
>Forza Motorsport 3 shown - trailers
>Halo ODST shown - demoed
>Halo Reach - trailers (teaser only! Also announced multiplayer BETA invites come with ODST)
>Alan Wake shown - demoed
>Improving Video service - 1080p HD video available STREAMING
>Sky Player coming to XBox for UK
>Facebook and Twitter coming to XBox
>Live Party can now watch shows together - like they promised way back when
At this point I had to do something else, so this is coming from other news sources (that are obviously less credible than me). I'll probably catch a video tomorrow to see the end.
>Metal Gear Solid Rising shown - NOT PORT OF MGS4 (apparently)
>Project Natal - camera motion thingy
>Peter Molyneux shows off Milo (???)
Have I missed anything?

