OMBD (open media database) is a free database for film media. There is no set editorial staff, but rather a large number of movie addicts and lovers who volunteer their time to provide material and develop the site. Anybody can add or change existing information on omdb once they have done the quick and simple task of signing up for their user login name. Films will thus be represented with equal opportunities hence Blockbusters, Soap Operas, and a college thesis film will each have their own place on omdb."
Data
2012-12-25: There seems to be no way at present to get the data in bulk but it could be possible to scrape it.
[Link is no longer valid: The whole omdb site can be checked out from a subversion repository: http://bugs.omdb.org/wiki/InstallFromSubversion]
License
Copyright page suggests that material is dual licensed under German port of CC-BY and the GFDL:
