Yes, YouTube is a great way to watch TV online, and you may have heard about Joost as well. That’s Skype’s overhyped and as I see now, rather annoying to navigate online video viewer. But there are hundreds of more video sharing sites out there. Mashable has a great summary of 33 different online video viewing programs. And yes, YouTube and Joost are on the list. But check out the 31 others. Plus people have recommendations in the comment field.
All you visitors from Mashable, the link you really want to look at is: Where to catch TV and movies you want to watch.