Solarmovie.is. It's the best I've come across. It's a 3rd party website that is basically a collection of links of other websites that have your movie/tv show that you wish to watch. It even tells you the quality of the movie (whether it's a cam corder, low quality DVD, or HD version).
I watched the newest Avengers movie on there the week it came out. I use it all the time. The latest episodes of TV shows get updated on there within a couple of hrs after airing.