Since I didn't see it posted anywhere, here is a charity Team Fortress 2 event video, starring day9, star, yogscast, and other celebrities and game developers.
To donate and info: http://tf2mixup.com/mix-up5/
Game casted by STAR_ and Sal
Video of map 1 (Upward):
Map 2 (Viaduct):
Map 3 (lakeside):
A little extra (it's hilarious at the end):