I believe FoxNews streams some of its shows live. Not sure which ones. Lately I have been watching the original Star Trek full version on CBS’s YouTube channel.
Fancast.com is another free site. You can get the full original Star Trek there also, as well as other popular shows, newer and older:). They use Hulu for some of their stuff and a few other sites for the rest of it. They also show ads during the videos but they are very short and not much of a bother.