Sharkle, launched in September 2005, is a nice entry into the social video space. The interface is pretty clean, and it does a nice job of keeping you surfing by suggesting related videos. Their Flash video player works well, but is sometimes slow to start.

Highlights from my visit (click on image to see video):

“are you sure clicking this thing will get us online?” (poor image quality, but funny)

The Beaty of Life: a really beautiful hand-drawn animation