The site is organized by subject area, and linked to Westlaw's databases. The directory of constitutional law web sites is an extremely useful starting point for research. Findlaw also indexes legal information on virtually every area of law. The LII provides comprehensive links to government, court and other law-related web sites. It's a great site and very easy to use, and provides an annotated overview of many areas of U.S. law.
All documents are searchable.
U.S.Constitution - Cornell University Hypertext version of the U.S. Constitution from Cornell's Legal Information Institute. U.S. House of Representatives Law Library - Federal Federal laws by source. Includes statutes, regulations and congressional hearings. U.S. House of Representatives Law Library - State State laws searchable by state. U.S. House of Representatives Law Library - Jurisdiction U.S. laws searchable by jurisdiction.