Updates to Team Fortress 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Engine
Fixed a crash related to model caches.
Fixed a crash related to empty proxy files.
Fixed a rare crash involving corrupted voice-comm playback.

Team Fortress 2
Fixed some issues with the community submitted tips.
Fixed a case where servers could get stuck in an infinite loop while spawning bots.
Made the training HUD code more robust, so... [read more]

Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Left 4 Dead 2
New mutation: Room For One.
Improved SurvivorBot’s ability to support players who stop moving to fight infected.
Improved SurvivorBot’s ability to support players in tight spaces.

Match Making Changes
Server searches for Official Dedicated servers no longer automatically fall back to Best Available. Lobby leaders will... [read more]

Updates to Team Fortress 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Team Fortress 2
Fixed training servers showing up in the server browser for other users
Fixed a crash related to level changes while playing a game with bots
Fixed a potential crash on startup
Remove debug "crash" command on dedicated servers
Get the full article at store.steampowered.com

Team Fortress 2 (TF2), the game PC Gamer magazine's editors have called the most fun game ever made, is now available for the Mac via Steam, a leading online platform for games with over 25 million accounts worldwide.

Like all the titles Valve has brought to the Mac platform, TF2 features Steam Play allowing gamers to make one purchase to play the game on both the PC and Mac. In addition, TF2 supports cross platform play -- so Mac gamers can play against/with PC gamers.

Those who purchase TF2 ... [read more]

Updates to Team Fortress 2, Day of Defeat: Source and Counter-Strike: Source Beta have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Engine
Made several changes that improve stability for clients running low on addressable memory.
Changed all HTML controls to use Webkit for the rendering engine.

Team Fortress 2
Added Mac support.
Overhauled the main menu, and added help to Loadout, Backpack, and Crafting screens.
Added ... [read more]

Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. They will be coming arriving with an upcoming title update on the Xbox 360. The major changes include:

Left 4 Dead 2
Changed Survivorbot item hunting behavior
SurvivorBots now stay closer to human players in all game modes
Fixed Survivorbot navigation issue in The Passing: Riverbank
Fixed bug where a SurvivorBot could become catatonic when attempting to save another Survi... [read more]

Battlefield: Bad Company 2 (PC)This trailer features VIP Map Pack 3 where players can enjoy the Laguna Alta map in Squad Rush mode and the Nelson Bay map in Squad Death match mode.
Get the full article at ign.com

Crysis 2 (PC)An E3 teaser video featuring "The Pinger".
Get the full article at ign.com

F.E.A.R. 3 (PC)This trailer reveals new levels and enemies.
Get the full article at ign.com

Updates to Half-Life 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Half-Life 2
Fix getting stuck after doing level transition from d2_prison_08 to d3_c17_01, the Nova Prospekt end battle

If you have a save game that causes you to be stuck in the teleporter with Alyx after this level transition you will need to manually restart this level to continue. To do that enable the developer console and type "map d3_c17_01... [read more]