Main site here.
This is my favorite movie site, because its aggregate nature means I have less busywork on my part, which I especially appreciate whenever the internet is concerned. Instead of navigating the breadth of reviewers out there, or just relying on whatever the newspaper or yahoo says, I get a democracy of sorts where every reviewer gets one vote.
There is even an electoral college, where arcane criteria divide Top Critics from other, less reputable sources. Roger Ebert is good. Some buffoon with a blog is bad. (Who, me?)
I also enjoy the debates (flame wars) when a particular critic bashes an otherwise popular movie. Take Armond White for example. This man has the ability to create controversy by hating every populous movie and liking every lambasted one. He gave rotten reviews to District 9, Harry Potter, and Up, which as of right now have 90%, 83%, and a 97% total scores. He gave fresh reviews to G.I. Joe, Transformers, and Dance Flick, which have 37%, 19%, and 19%. This man incites the forums to a riot, and can get away with it because he's respected (feared) within the film community.
I'm somewhat concerned that a site like this will push smaller, less cumulative avenues for movie reviews into the alley. Though as a consumer, I'm always looking for more bang for my buck. Why click on one movie reviewer at one site when I can get them all at the same time?