If you're planning on picking the game up--or own it and haven't fired it up in a while--make sure to download the "Complete" mod, which adds a slew of enhancements to the game. The latest S.T.A.L.K.E.R. Complete 2009 mod kit is available right now, for free, on FileShack.
The Games for Windows marketplace is offering a new title for 99 cents each day until December 8. Previously the sale featured Viva Pinata and Deus Ex, among others.
More post-nuclear fallout action is planned for the far-flung future, with S.T.A.L.K.E.R. 2 planned for release in 2012. The series' most recent entry, S.T.A.L.K.E.R.: Call of Pripyat, launched earlier this year.