Here are some good links to movie review services:

Movies.com has a good review service at: http://www.movies.com/movie-reviews

Internet Movie Database: www.imdb.com

Rotten Tomatoes.com: http://www.rottentomatoes.com/

Roger Ebert: http://rogerebert.suntimes.com/

Movie Review Query Engine: http://www.mrqe.com/

Plugged In.com: http://www.pluggedin.com/movies.aspx

MovieFone.com: http://www.moviefone.com/reviews

MovieReviews.com: http://moviereviews.com/

Yahoo Movie Reviews: http://movies.yahoo.com/

Kids In Mind: http://www.kidsinmind.com/