http://www.gametrailers.com/video/e3...t-4-dead/49968
http://www.gametrailers.com/video/e3-09-left-4-dead/50625
http://www.gametrailers.com/video/e3-09-left-4-dead/50622
http://www.gametrailers.com/video/e3-09-left-4-dead/51031
http://www.gametrailers.com/video/e3-09-left-4-dead/51033
http://www.gametrailers.com/video/e3-09-left-4-dead/50556
http://www.gametrailers.com/video/e3-09-left-4-dead/50554
http://blip.tv/file/2220393/