Roger Ebert - "The best of three Star Wars films, and the most thought-provoking." [4/4] - http://rogerebert.suntimes.com/apps/pbcs.dll/article?AID=/19970221/REVIEWS/702210302/1023
Rotten Tomatoes - Several reviews and reactions from critics. Includes some general movie information. - http://www.rottentomatoes.com/m/empire_strikes_back/
The Sci-Fi Movie Page - Extensive movie review. [4/4] - http://www.scifimoviepage.com/empire.html
Brunching Shuttlecocks - Review by the Self-Made Critic. - http://www.brunching.com/empire.html
Washington Post - A small selection of critical reviews. - http://www.washingtonpost.com/wp-srv/style/longterm/movies/videos/empirestrikesback.htm
Allscifi - Detailed analysis of the movie, with a list of literary elements and themes in the movie. - http://www.allscifi.com/Topics/Info_3508.asp
New York Times - A mediocre review from 1980. Free registration required. - http://www.nytimes.com/library/film/061580empire.html
Movie Review Query Engine - A directory of links to many online reviews. - http://www.mrqe.com/lookup?^Star+Wars%3a+Episode+V+-+The+Empire+Strikes+Back+(1980)
All-Reviews.com - A collection of reviews, plus facts about the movie. [Overall: 4/4] - http://www.all-reviews.com/videos/empire-strikes-back.htm