Steam has Portal 2 on their store, with a release date of 09 February 2011!
There is no option to pre-purchase yet; but they do have some really sweet videos and screenshots.
Valve also has an official Portal 2 website with some awesome long and high-quality videos and wallpapers to make you drool while you wait in anticipation for this seemingly-Valentine's Day release (something to do with the Weighted Companion Cube and the hearts on its sides?!)
The extended co-op video, Portal 2: Cooperative Testing Initiative, has me stoked. I'm very excited to see where they go with that campaign. It appears one bot gets the blue/orange portals and the other gets red/yellow portals.
Other extended videos, like Meet Wheatley, show the innards of Aperture Labs and all the mass-manufacturing GLaDOS is doing. The lighting looks amazing and the full ambient creepy atmosphere looks more gorgeous than ever.
I can't wait to see it for real. Look at me still talking when there's science to do...
