50 must-watch video clips via →[More:]
I don't know about any of the other categories, but the comedy one has a couple of good ones. The rest aren't all that good, IMO.

Good ones (from the list):
#1: Dramatic Chipmunk that is actually a prairie dog.
#3: iRack

From the comments: OK Go - Here It Goes Again, on treadmills!
I don't remember where I found this one: Daft Girl