General Streams-
Gamespot on Twitch.TV:
Gamespot on Gamespot Site:
http://e3.gamespot.com/press-conference/microsoft-e3/
IGN on, well, IGN:
http://www.ign.com/events/e3/2012/live-video
Gametrailers on Ustream:
http://www.ustream.tv/gametrailers
Gametrailers:
http://www.gametrailers.com/netstorage/e3/live.html
Gameinformer:
http://www.twitch.tv/gameinformer
Official Streams-
Microsoft:
Sony:
http://us.playstation.com/e3-2012/
Nintendo:
lets get more going!