Best Megaton of E3? We have our winner. In case you didn't see it, hit the break to watch Aperture Science's GlaDOS and Valve's Gabe Newell announcing Portal 2 for PS3.
Not to mention, you also get the trailer shown at the Sony press conference.
Two birds, one stone.
The game releases day and date with the 360 and PC versions next year, and will be the only console version to have Steamworks. Amazing.