A robot faction is introduced into the Team Fortress 2 equation, via this amazing new trailer by Valve.
Meet the Medic - Behind the Scenes
See outtakes and learn about Valve's creative process in this behind the scenes article for their Meet the Medic short.
Portal 2 - Authoring Tools Open Beta
The universally acclaimed Portal 2 is getting a level editor. Valve has launched an open beta for the game's authoring tools.
Portal 2 - Boots
The science of the boots used in Portal 2 is explained in this latest video from Valve.