New York Public Library for the Performing Arts, Billy Rose Theatre CollectionOne of the largest and most comprehensive archives of the theatrical arts. While most items have to be viewed in New York, the website provides access to items in their digital gallery, as well as links to resources on full text play sources, history, musical theatre, vaudeville, circus, design and stagecraft, and international theatre, to name a few.
Theater and Dance Research Guide, Yale UniversityThis is the the Theater and Dance Research Guide from Yale University Library. It is designed for Yale students, but there is much here that may be used by the general public, such as the links under Reference Sources
Aisle Say"The Internet Magazine of Stage Reviews and Opinions." It also includes a list of index links for theater reviews in specific cities and links to other resources.
Internet Theatre DatabaseSimilar to the Internet Movie Database (IMdb.com), this site is searchable by show, person, theatre, song title, character/role, and production role; there is also an advanced search option.
CurtainUp"The Internet Theater Magazine of Reviews, Features, Annotated Listings." The latest reviews and features are organized by location on the home page; the site is also searchable. As the site is geared towards people who travel to see plays, it provides links for theaters, restaurants, hotels, and other attractions in the cities they cover. The site is updated regularly.