Best of the Web

Metacritic.com

Gathers reviews from respected critics and publishers on current films, DVDs, television shows, and movies, and rates them on a percentage basis. Links to reviews used to arrive at the ratings are provided.
Rotten Tomatoes

Scours the internet for reviews of films and games, from the amateur to the professional, and uses the aggregate data to determine if the review is positive or negative. Links to full-text reviews are provided. Reviews can be limited to the New York area, to respected critics, or to critics belonging to film critic societies.
Screen It!

"Entertainment Reviews for Parents," . . . clinical analysis of films. Reviews the film with explanation of MPAA rating and suitability for various age groups