fflick - movie reviews via Twitter
This new site, fflick, looks like a good idea. If you're on Twitter, you can use fflick to see what people think of certain movies. It will crawl all your friends' tweets to find any movies mentioned and group them for you. It also aggregates all movie mentions and gives them a score, even ones that aren't out yet.
For example, there have been over sixty-one thousand tweets about Salt, as of this post, giving it a score of 64% positive. You can sort the mentions by Friends, Positive, Negative, etc.
Oh, and there's a button to add the title to your Netflix queue. :)
Here's Roger Ebert's page on fflick.