jones_supa writes: The holiday sales of Steam are, uhh, running full steam. Among the discounts, Valve is giving Left 4 Dead 2 as a free Christmas present for anyone who has an account. So if you are interested, remember to grab your copy before 10:00 PST on December 26. Left 4 Dead 2 is a survival-horror first-person shooter with a heavy emphasis on cooperative gameplay. Windows, Linux and OS X are supported.