Rotten Tomatoes: Upcoming Movies
Movie release schedule listed by seasons, accompanied by publicity shots and synopses.
http://www.rottentomatoes.com/movies/upcoming.php

Reel Cinema: Calendar
Listing of films coming to theaters and video.
http://www.geocities.com/smvgrey/calender.html

Reel Movie Critic: Future Films
List of films that open in the US in the next month.
http://www.reelmoviecritic.com/cmrff/id1870.htm

Release Dates
From Pete's Movie Page.
http://www.petesmoviepage.com/release.shtml

The Web's Film Release Schedule
Film release schedule and weekend box office data from Eric Carter.
http://www.filmreleases.com/

IFILM - Upcoming Movies
Listings of upcoming theater releases by date, with links to trailers and video clips.
http://www.ifilm.com/movies/upcoming

Film Releases
Schedules, news and information about upcoming movies.
http://www.film-releases.com

Metacritic: Upcoming Film Releases
Features release dates and brief comments for upcoming major and limited release films.
http://www.metacritic.com/film/upcomingreleases.shtml

MovieWeb: Releases
Weekly release schedules.
http://www.movieweb.com/movies/releases/week.php