The official Steam client for OS X is finally here! Currently the titles are limited to the newest Civilization, Torchlight, Portal (which is free right now if you don't own it!), and a few Indy games. However Valve has promised to release new games each Wednesday. Here is hoping for Team Fortress 2 or Left 4 Dead next week!

Right now I am speculating that TF2 will be the next title up. Reasons? Well it was mysteriously available for download on my Mac install right after the client release. Then it was pulled and since doesn't show up in my game library on OS X at all! However if I log in on my PC it returns. This is hardly conclusive evidence, however Team Fortress 2 is still my bet for the next Valve Mac title.