SCREENIT! is a very detailed movie review site. It gives very detailed specifics about plot, language, nudity, scary scenes, etc...
Scroll Down to the bottom and click on the "No Thanks" to use it free.
Plugged in is a ministry of Focus on the Family and focuses on giving people tools that will help them successfully navigate the world of media. Movies and Music are key areas your child is influenced and this site allows you to understand them a little better.