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IMDb.com - Internet Movie Database
International Dictionary of Films & Filmmakers - Search by film title, or actors' or directors' names. (Wellesley login required)
Media History Digital Library - Searchable online archive of digitized industry publications & fan magazines, from 1903.
Academy of Motion Picture Arts & Sciences Resources & Databases
This Wikipedia article provides a helpful overview of the roles of members of film crews. You can use these definitions to better understand film credits.
The Dictionary of Media Studies provides additional information about roles, techniques, technologies, and industry terms.
To find film & television scripts, try searching in the library catalog by film title, e.g., "freaks and geeks." You can also try these script databases:
American Film Scripts Online (Wellesley users)