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American Film Institute: 100 Years . . . 100 Songs
With this list, the American Film Institute presents its choices for the 100 greatest songs in film. The list includes choices from popular films such as The Sound of Music, Cabaret and The Producers.
Naxos Digital Services
Naxos Digital Services: Classical Music Used in Films
This site has a comprehensive list of films that have used classical music for their score. There are plenty of audio links too.
New York Times
New York Times: Hollywood Composer
Survey the career of John Williams, a prolific composer of movie music whose work includes the scores of many blockbuster films such as "War of the Worlds" and "Star Wars: Episode III - Revenge of the Sith."