Theatre
American Variety Stage: a multimedia anthology selected from various Library of Congress holdings. This collection illustrates the vibrant and diverse forms of popular entertainment, especially vaudeville, that thrived from 1870-1920. Included are 334 English-and Yiddish-language playscripts, 146 theater playbills and programs, 61 motion pictures, 10 sound recordings and 143 photographs and 29 memorabilia items documenting the life and career of Harry Houdini. Groups of theater posters and additional sound recordings will be added to this anthology in the future.
Applied and Interactive Theatre Guide
Musicals101.com: the history of musical theatre and film
Theatermania.com: News, Reviews, Discounts, and more
Film
Academy of Motion Picture Arts and Sciences
Allmovie.com: searchable by title, personal name, plot and keyword
Internet Archive: Feature Films
The Internet Movie Database: film facts, bios and more
Movie ratings guide: from the Classification and Rating Association
Movie Review Query Engine: review of over 25,000 movies
Steven Spielberg Jewish Film Archive
Toonopedia: cartoons, animated films and comics - repository of "toon" knowledge
Dance
Dance Magazine Guides and Resources
MusRef: Music and Dance Bibliography (Brigham Young University)
New York Public Library Jerome Robbins Dance Division
Television
American Archive of Public Broadcasting
Archive of American Television
DTV.gov: digital television transition (from the FCC)
OpenVault (WGBH Media Library and Archives)
Recapo.com: see what was on the talk shows you missed!
New York Radio Guide: radio stations in the metro NY area