Valve announced today it will bring Steam, Valve’s gaming service, and Source, Valve’s gaming engine, to the Mac.
Steam and Valve’s library of games including Left 4 Dead 2, Team Fortress 2, Counter-Strike, Portal, and the Half-Life series will be available in April.
“As we transition from entertainment as a product to entertainment as a service, customers [...]

This weekend on Steam get Operation Flashpoint for 75% off, that’s only $7.49!
About Operation Flashpoint: Dragon Rising

Operation Flashpoint: Dragon Rising is a game about a fictitious conflict on one of the Sakhalin islands, a conflict that is in danger of erupting onto a global scale. The player takes the role of a US soldier, [...]

New updates to Team Fortress 2 have been released. As always the updates will be applied automatically when your Steam client is restarted. The major changes include:
Engine
* Fixed servers being inappropriately delisted from the master server
Team Fortress 2
* Updated CTF_Doublecross
* Improved clipping to [...]

This weeks midweek madness deal is Wings of Prey for 50% off, making it only $24.99.
About the Game
Wings of Prey is based around the large-scale aerial combat and ground military operations of World War II. Players can participate in some of the war’s most famous battles piloting fighters, battle planes and bombers across a [...]

New updates for Mass Effect 2 have been released for the PC version. As always the updates will be applied automatically when your Steam client is restarted or you can download it directly here.
*Fixed video hitching and crashes related to single core machines
* Single core users may experience short periods of black screen that [...]

THQ and Valve today announced an agreement to power the PC version of 4A Games’ Metro 2033 with a collection of Steamworks features and to offer the title electronically to the 25 million-plus gamers playing PC games via Steam.
Metro 2033 is an upcoming action-oriented title with a combination of horror, survival, RPG, and first-person shooter [...]

This week on Steam get Shadowgrounds and Shadowgrounds Survivor for 75% off. You can pick up both in a pack for $4.99 here or you can buy them individually priced as follows.
Shadowgrounds – $2.49
Shadowgrounds Survivor – $3.74