Red Orchestra 2 FREE for one day only. Note that this does not include the expansion Rising Storm. You can still play the Rising Storm maps but you're limited to one playable class. If you're into WWII or slower realistic shooters its worth the download. It's Free!
http://store.steampowered.com/news/13116/Portal 1 and 2 are also on sale. 6.25US for both. If you haven't played the Portal games or like puzzle games you should check them out.
The Arma II games are on sale as well. A few dollars for the base game a bit more for the newer expansions.
