It's called Kids in Mind, and goes into great detail on various aspects of new films: violence and gore, substance use, sexuality and nudity. Check out their feedback on Disaster Movie, it's excruciatingly detailed -- but you don't have to read it all, you can get the basic idea in seconds: not for kids!
You can also just glance at the rating number assigned to the film; that's based on how many objectionable or inappropriate moments the film contains. The higher the number, the hotter the content. For instance, Disaster Movie has a 7.8.5 rating, and Swing Vote has a much friendlier 1.2.5 rating. Here's the reason this site is so helpful: both movies are rated PG-13!
BTW, I saw Swing Vote, and saw it with a friend who has the exact opposite political leanings as I (that's what happens when you leave San Francisco! You broaden your social circle horizons!), and we both laughed a lot, and probably thought, at least for a second or two, "Hmmm. That's a good point about my side that's not particularly positive..."). It was a darn good movie for a regular old Hollywood vehicle, starring Kevin Costner, and is thought-provoking for kids and adults alike. It's definitely appropriate for slightly older kids, maybe 11 or 12 and up.
I've just added Kids in Mind to my list (at right) of film sites that I use, and I'll soon be adding a list of cool and useful parenting sites to that column as well.
If you're new here, welcome to KidsFlix, where we hope to give you the tools and knowledge to allow your kids to be intellectually stimulated AND entertained by the big black box in your house!