Okay, so I had this big long write up about how crazy Left 4 Dead is, and why you should give it a look, but then I remembered how 70% of this forum's population is bat shit crazy for games. So instead, i decided just to post this video for you to watch, it's 10 minutes of just straight gameplay. If you don't have 10 minutes then just bounce around the vid to get a feel for what this game really is: killing lots and lots of sprinting-right-at-you s:
http://www.youtube.com/watch?v=NWuajo8_eUY
http://www.youtube.com/watch?v=NWuajo8_eUY