I spoke of Hulu early on the class (I'm a big fan) as it allows you to watch missed shows with very limited commercial interruptions and even better, has quite a variety of content.
At launch, Hulu will offer full-length episodes of more than 250 TV series, from current hits such as The Simpsons to older shows such as Buffy the Vampire Slayer. It also will offer 100 movies, including The Big Lebowski and Mulholland Drive.And the best thing: it's free.