It would be an understatement if I said that I love Portal. It would be an even larger understatement to say that I believe Valve is the greatest game development studio of our time. Yeah, that's right! You listening over there in Mesquite, you id freaks? Doom, what? Quake, huh? Anyway, that's a post for another day. Today, just revel in the awesomeness of this Portal 2 preview from E3.