Besides IMDB..
 

Where can get I list of upcoming theater movie Release dates with the studio who distrubutes them? IMDB has a habit of putting the wrong studio.

You can go to www.upcomingmovies.com and then simply click on "By Distributor."

Maybe try All Movie Guide also (www.allmovie.com) - I don't know if they are any more correct than IMDb though.

http://www.comingsoon.net/movies.php By date

http://www.comingsoon.net/database.php
by title

thanks all

Greg's Previews on Yahoo! usually has good info:

http://movies.yahoo.com/upcoming/

IMDB lacks in the department of upcoming movies. Aside from that, they pretty much nail every other aspect of cinema to a tee. (They even have MTV Movie Award winners!) When I first saw your thread title I was ready to make an instant defense for IMDB on whatever topic but they do lack in upcoming releases.

...and, of course, there's always AICN. :D