TheTruthHurts! on 21 April 2009
L4D Survivor Pack is available today (FREE) on XBox Live 360 and PC. The pack is 101MB. I have enclosed below the link to XBox.com's where you can set up a direct download to you 360. I have also included a link (second link) to the official site that gives a detailed explanation of what the survival mode includes.
Go forth my friends and kill many Zombies.....Infected.....whatever! 
http://marketplace.xbox.com/en-US/games/media/66acd000-77fe-1000-9115-d80245410830/
http://www.l4d.com/blog/post.php?id=2417
