Valve are introducing the Perpetual Testing Initiative for Portal 2 with this new amusing trailer.
Valve have created Expiration Date, a 15 minute animated short featuring all the Team Fortress characters.
Half-Life Black Mesa
A relentless team of fans have finally released Black Mesa a remake/upgrade of the first Half-Life game from Valve.
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.