If you're a casual watcher, or just want to watch a few episodes to see if you'll like it etc, check it out on hulu.com.
They have all kinds of shows, series, and I think they also have movies, but I've never watched a movie on their site.
You can't d/l or "dvr" from them, and there's limited commercials, so if you're like me and refuse to be dictated to by Dick..errr, Dish Network and the like...well, ya gotta do what ya gotta do lol