Portal: Survive! is a live-action short film based on the Portal game, and its tie-in comic Portal 2: Lab Rat.
Portal Trick Shots
Corridor Digital combine the science of Portal with basketball trick shots in their latest short film.
Dota 2 - Cinematic Trailer
Valve have released an action packed cinematic trailer for their new game, Dota 2.
Portal 2 - Boots
The science of the boots used in Portal 2 is explained in this latest video from Valve.