**IMDb ** (Internet Movie Database) http://imdb.com
RottenTomatoes combined movie reviews http://rottentomatoes.com
Also their question boards
Sample IMDB: http://us.imdb.com/title/tt0324133/board/threads/
Sample RottenTomatoes : http://www.rottentomatoes.com/forum/forumdisplay.php?forumid=101123621
I’d better give some idea of what RottenTomatoes is like, since it may not be obvious from the main page.
Here’s the review page for a recently discussed movie
http://www.rottentomatoes.com/m/SwimmingPool-1123621/
In addition to the two you mention:
www.boxofficemojo.com
For box-office statistics
http://movies.yahoo.com/
For local showtimes, trailers and general movie information
http://www.suntimes.com/index/ebert.html
Ebert’s site. Reviews going back to 1985 and his “great movies” series among other stuff.
Rottentomatoes is my favorite, but http://www.metacritic.com isn’t bad either.