Steam News announces that preloads are underway for the Left 4 Dead 2 demo for customers who have preordered the co-op zombie shooter sequel:

Those who have pre-purchased Left 4 Dead 2 via Steam may begin pre-loading the demo, which is due to open early access on Tuesday, October 27. The early access to the L4D2 demo is open to both retail and Steam customers on both the PC and Xbox 360. Those who pre-ordered via retail should be able to pick up their early access codes now and be ready to play the demo on Tues.