Usually some kind of show or anime I'm never able to watch or wasn't able to watch because of lack of resources. I even saw the whole FMA movie there. Shh.
Other than that, that's the first place I go to when looking for a music video or something like that. I've seen parts of plays and other things that otherwise I'd have to go to a theater for. Usually things I'm too lazy to buy. :/
Dramatic Hearts, Naruto, Dysfunctional Hearts (Wish he would update soon) I also like to watch KH2FM and RE:COM videos, basically all of Deathspank's videos. And really, I could go on for hours. I watch alot of vids on Youtube.