http://www.youtube.com/watch?v=HcHQ9yKRht0

Check them out: http://www.youtube.com/watch?v=tuCgdhqZZ4c

All of you guys play on PC i guess... but here's an update to Xbox360:

Valve has released a server-side fix to deny the recently reported cheats on all dedicated Left 4 Dead Xbox 360 servers. The fix is designed to halt the cheating behavior on the dedicated servers, which accounts for the majority of the co-op and Versus modes of play. A title update for those playing on user-hosted servers and/or via system link will be released in the coming days.

http://www.youtube.com/watch?v=HcLRaeJ-sBA

and

http://www.youtube.com/watch?v=E6k7cGbjwuM

On the Hospital level:

http://www.youtube.com/watch?v=XzBUo9z2ZvE&eurl=http://left4dead411.com/&feature=player_embedded