An extensive collection of online encyclopedias and dictionaries, good for context for topics. The articles often include bibliographies of additional material.
Literature Resource Center
While the Literature Resource Center has biographical information, peer-reviewed journal articles, and book reviews, it also has a Topic Finder, which allows you to browse article and find a focus for your research.
Click on Topic Finder at the bottom left of the page, put an author's name or title of a work and browse the results.