Similar to Moviefinder is Moviefone . Moviefone is a good resource, but I like Moviefinder a little better. Moviefone has many of the same features as Moviefinder including reviews, information, previews, and a theatre locator. I've had some problems with the Moviefone site in the past. Moviefinder is more professional and consistent, and more reliable.
Many films have their own websites prior to release.
These sites are sometimes extensions of the films themselves, and other times informational resources. Often, the site for the film will contain casting information and other tidbits, like the preview, and so on. Certain film sites blend the line between film and reality. The Blair Witch Project film site is an extension to the film. Though the film was hyped as a true story, it was actually fictional.