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 first person spectators seeing particle effects on the wearables of the person they're spectating.
Added the Pyro's "Foster's Facade" and "Stockbroker's Scarf" items as part of Tripwire's Twisted Christmas event.
See http://www.killingfloorthegame.com/xmas/ for full details
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Australia Federal Home Affairs Minister Brendan O'Connor and NSW Attorney-General John Hatzistergos front a press conference at the December 10, 2010 SCAG meeting to explain the delay in the introduction of an adult classification for games Down Under.
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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
Updated some files, for no reason whatsoever
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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 the coin particles effect on the Treasure Hat
Fixed some of the deathnotice icons using the wrong colors
Get the full article at store.steampowered.com

Christmas is coming early for Killing Floor fans, with the massive Twisted Christmas event starting next week, just in time for the holidays. Featuring Christmas themed specimens replacing all of the regular baddies, a brand new level – Santa’s Evil Lair, Christmas themed achievements with a special unlockable character, an all new difficultly level and [...]
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We take a look back at everything that happened in the world of games in the third quarter of 2010.
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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
Added the hats for The Great Steam Treasure Hunt.
Fixed a bug that enabled players to weapon switch away from the Iron Curtain during spin down
Get the full article at store.steampowered.com

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

Left 4 Dead
Fixed voice recording intermittently stopping on Mac OS X
Fixed mp3 playback not working on PC
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Updates to Counter-Strike: Source Beta have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Source engine changes
Made another pass on De_Inferno bug fixes
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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
Added check to prevent control characters from user-provided item names and descriptions (replaced with spaces).
Fixed a control point bug where players could capture points that were already owned by their team.
Fixed a server crash caused by kicking a player that isn't fully connected.
Fixed Spies being able to destroy sappers... [read more]