Portal: Survive! is a live-action short film based on the Portal game, and its tie-in comic Portal 2: Lab Rat.
Half-Life: Raise the Bar
Half-Life: Raise the Bar is a fan-made short film inspired by the Half-Life franchise.
Team Fortress 2 - Meet The Pyro
Valve have released a brilliant new Team Fortress 2 character-centric short animation, this time for the Pyro.