Good article from Law.com about how the Internets virtual law libraries provide great legal research information.
Some of the most extensive and accurate Web sites are virtual law libraries, such as those maintained by Cornell, Georgetown, Emory, Indiana and Washburn universities. In addition, the researcher can feel comfortable with the Internet Law Library, formerly maintained by the House of Representatives and now part of LawGuru; and the Law Library of Congress, just to name two of numerous sites out there.
At Georgetown University’s law library, part of its mission as the research arm of the faculty and students of Georgetown Law Center is to "collect and organize information about research resources on the Web." This site, as well, is quick-loading, with extensive federal and state collections, and links to other research sources. Georgetown also provides a thorough tutorial section on researching statutory, case law and secondary sources.