Samourai TV

I was familiar with Hulu and Fancast, but Online Video Guide is a great resource for other lesser known sites.

As explained on Yahoo-

Free TV and Movies

Head online to watch free episodes from hundreds of TV shows — old and current — as well as free movies. And it’s perfectly legal.

At OVGuide.com you’ll find a list of TV and movie sites including Hulu.com, Veoh.com and Fancast.com, as well as individual network Web sites, such as ABC.com and CBS.com.