Didn't see a thread for it, to which I call blasphemy.
S.T.A.L.K.E.R. is a series of first person shooter games revolving around the meltdown of the Chernobyl nuclear power plant. The story itself is pretty thin but it's okay because the game itself is awesome.
There are 3 games currently out:
Shadow of Chernobyl - First in the series. Released in 2007. You play the role of "Marked One" as you traverse the zone.
Clear Sky - Prequel to SoC.
Call of Pripyat - Sequel to SoC
S.T.A.L.K.E.R. 2 is set to be released some time in 2012.