I had this link in my bookmark toolbar for a good while but never had the time to look at it, let alone the bandwidth. It's called TV Links and I've just noticed that there are real classic television shows that you normally wouldn't find on general release DVDs. You can stream full episodes from the latest Heroes or Curb Your Enthusiasm episode to Monty Python Flying Circus and Dogtanian And The Three Muskehounds.
It's essentially Youtube but with a neat accessible layout. There's also a list of movies, documentaries and cartoon shows. Enjoy.
Update: Two days after my post on streaming TV and Movie, KaZoop compile the top 10 of similar sites.