http://www.homeschooling-ideas.com/teaching-with-movies.html

A great list to spark conversation & further research  

http://www.pluggedinonline.com  is a great web site for finding all the ins and outs of childrens or any movie for that matter, breaks it down into detail the good and the bad, possitive and negative, so you don't have to sit through a movie first to check on it.
I find that you can't just go by ratings these days.