Not sure how long this site will last, but it links to a wide collection of TV shows and movies.
Issues of legality aside, it is quite enjoyable to stream and watch commercial-free episodes of TV shows one after another. The technology appears ready for making this experience mainstream, but the right legal / business model hasn't been established yet. Perhaps Apple or Netflix (or Google) will make this work...
My favorite shows on this site are The Office and Scrubs. By watching the episodes consecutively, it makes it easier to be more aware of the larger structure and connecting themes of the series... Actually, there are some similarities between these two workplace sitcoms: transition from newbie to seasoned veteran through the crucible of work, the latent love affair between two co-workers who are best friends, the flawed but well-meaning boss/mentor...
Some comments on peekvid: