Valve sends a reminder that early access to the Left 4 Dead demo begins today for those who have preordered the multiplayer zombie shooter for either Windows or Xbox 360. These customers will be able to play the demo for several days before it opens up to general access for seven days starting November 11:

Early access to the Left 4 Dead demo begins Thursday, November 6 on both the PC and Xbox 360. The early demo access is scheduled to begin around 2 am PST on the Xbox 360 and 7 am PST on the PC. This promotion is being offered in addition to the 10% savings for those who pre-order and applies to all Steam PC pre-orders and all PC and Xbox 360 pre-orders from GameStop and EB Games in North America. On November 11 the demo will be made available to all PC and Xbox 360 gamers worldwide, with no obligation to purchase. The demo concludes on November 18, when Left 4 Dead will be made available at retail outlets across North America and worldwide via Steam.