Jason Rohrer, John Romero, and Jenova Chen compete to make a game religion.
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Updates to Half-Life 2, Portal, Half-Life: Episode One and Half-Life: Episode Two have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Half-Life 2, Portal, Half-Life: Episode One and Half-Life: Episode Two
Better support for Intel Sandy Bridge based machines
Fixed a bug where some video configuration could get reset by restarting the engine
Get the full article at store.steampowered.com

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

Source Engine Changes (CS:S, DoD:S, TF2, HL2:DM)
Fixed a server crash exploit caused by malformed network packets

Counter-Strike: Source
Updated De_Inferno
Community fixes

Team Fortress 2
Fixed the Amputator and the Crusader's Crossbow healing teammates that have the E... [read more]

Act now and take advantage of huge savings! Half-Life 2: Episode Two is available at 75% off during the Midweek Madness sale. Offer ends Thursday at 4pm PDT.

Half-Life® 2: Episode Two is the second in a trilogy of new games created by Valve that extends the award-winning and best-selling Half-Life® adventure.
Get the full article at store.steampowered.com

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

Source Engine Changes (CS:S, DoD:S, TF2, HL2:DM)
Improved the version mismatch error message received when connecting to a server with a different version than your client

Team Fortress 2
Made Bill's Hat always tradable.
Fixed a client crash caused by a malformed custom... [read more]

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

Source Engine Changes (CS:S, DoD:S, TF2, HL2:DM)
Further improved engine handling of server queries.

Team Fortress 2
Added Rift promotional items
New items: Sun-On-A-Stick and Sharpened Volcano Fragment.
New achievement: Riftwalker
Updated several more models with optim... [read more]

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

Source Engine Changes (CS:S, DoD:S, TF2, HL2:DM)
Improved engine handling of server queries
Get the full article at store.steampowered.com

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

Source Engine Changes (CS:S, DoD:S, TF2, HL2:DM)
Fixed the dedicated server not running on machines using Win2k

Team Fortress 2
Added the Monday Night Combat gear
Added Crit-a-Cola to the weapon drop list
Added missing chalkboard/serverbrowser materials for 5Gorge
Fixed... [read more]

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

Source Engine Changes (CS:S, DoD:S, TF2, HL2:DM)
Added the "Server can execute" flag to the “r_cleardecals” command.
Fixed a problem where the microphone transmit volume sometimes had no associated control and was disabled in the Audio options dialog.
Fixed a c... [read more]

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

Source Engine Changes (CS:S, DoD:S, TF2, HL2:DM)
Fixed an engine crash caused by too many precached models in some community maps.
Day of Defeat: Source
Fixed an exploit where clients could prevent weapons from recoiling properly.
Team Fortress 2
Added several crafting r... [read more]