I primarily use myvidster. They tend to have everything from amateur to studio videos, and I can easily bookmark the videos I like to come back to later. Unfortunately, if the site hosting removes the video, then you have to search for it again, and people tend to bookmark them with any and every name they can think of. Also, it tends to have more ethnic (Black & Latino) videos, which isn't necessarily what I am searching for, but nice to have the variety.

I also like to watch Cam4 to watch random guys worldwide j/o.

Used to be an xtube fan, but as someone mentioned, too many sponsored videos.