Internet Movie Database (IMDb)

IMDb is an incredibly authoritative source for movie, TV and celebrity content. They offer a searchable database of more than 100 million data items including more than 2 million movies, TV and entertainment programs and more than 4 million cast and crew members.

IMDb also offers news, box office analysis, photos, trivia, the Starmeter, and more.  Pro IMDb members can access contact information (subscription required).