Updates to Counter-Strike: Source, Team Fortress 2 and Day of Defeat: Source 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)
The mat_hdr_level, r_rootlod, and r_waterforceexpensive settings are now saved in the user’s config file.
Fixed clients being able to connect to servers with spoofed SteamIDs.
Fixed a bug where some video configurations could get reset by restarting ... [read more]

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

Server Browser
Fixed the server browser not saving filter settings properly

Team Fortress 2
Fixed a speed exploit related to benchmarks
Fixed Parasite hat not being posed correctly on class loadout panels
Fixed a level change crash
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Updates to Counter-Strike: Source, Team Fortress 2 and Day of Defeat: Source have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Engine
Tuned thread initialization to improve performance on CPUs with more than four cores

Counter-Strike: Source
Fixed leftover shadows when ragdoll physics are disabled
Added stats gathering to track client and server performance
Added instrumentation to help debug network issues
Disabled so... [read more]

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

Engine
Increased the resilience of client/server data table mismatches when playing back demos. This will make most old demo files playable again, but with potential visual side effects

Team Fortress 2
Updated CP_Coldfront
Added map to the default mapcycle and motd files.
Fixed a server crash i... [read more]

Now you can enjoy Day of Defeat: Source, the WWII mulitplayer classic from Valve, on your Mac! Assume the role of infantry, sniper or machine-gunner classes and experience the intense online action set in Europe during WWII.
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Updates to Team Fortress 2, Counter-Strike: Source and Day of Defeat: Source have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Engine
Fixed client crash related flashlight usage.
Fixed several issues related to alt-tabbing (invisible players, etc).

Team Fortress 2
Added The Frontier Justice.
Added The Wrangler.
Added The Gunslinger.
Added The Southern Hospitality.
Added 35 Engineer achievements.
Engineers can now picku... [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 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:

GameUI
Fixed the desktop resolution not appearing in the list of valid resolutions when using windowed-mode.

Server Browser
Fixed a crash caused by leaving the server browser open while playing.

Engine
Added client/server version check on client connect.
Fixed a crash caused by hitting ct... [read more]

Updates to Day of Defeat: Source have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Day of Defeat: Source
Fixed a client crash caused by the flashlight
Fixed an issue where Linux dedicated servers would not automatically retrieve master server addresses.
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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 and Day of Defeat: Source
Fixed a case of client-side hitching caused by writing a file to the hard drive too frequently
Get the full article at store.steampowered.com