Portal 2: Footage (Part 1, Apparently)

We've already seen the trailer, but there was also some footage of Portal 2 in action at E3, and Valve have just released the direct feed. It's mildly spoilerish, and introduces a new character, as well as gives us a glimpse of an old one. It also makes me flush with anticipation for Portal 2. On the Universal List Of Reasons To Be Excited this can be entered quite high.