A Youtube user uploaded a Portal 2 playthrough, edited down to the developer commentary portions. Above is part one. (The paint/gel mechanics are derived from a student game called Tag: the Power of Paint. Very interesting to listen to how the designers "train" the players as they play through the game.)
And speaking of Portal, here's some Chell screenshots:
The Valve store sells Aperture Science tank tops, but no orange jumpsuits.
