Thanks to jerry for the head's up.
Not much to say here folks, other than "go watch this now!" This is a small trailer for the recently announced standalone game Portal using Source engine technology. As described in the original newspost I made about the game, you are introduced as a worker in the "Aperture Science Enrichment Center" being taught how to use the "Aperture Science Handheld Portal Device" and well, you'll just have to watch it to believe it.
I don't want to go off on how absolutely awesome the trailer and game itself look, so I'll just say this: it looks like Prey on speed. Download, watch, drool, wait patiently until game is released. Rinse and repeat.