LEFLAW'S VIRTUAL LAW LIBRARY®
Sources for Federal Information
The US Code Page. The complete USC online. Everything is entirely text searchable.
The Legal Information Institute. Sponsored by Cornell University Law School, this site is an excellent database of all sorts of legal information.
The US Supreme Court Site. This site, sponsored by Cornell University, lists all of the Supreme Court's opinions shortly after they are handed down. The database extends back to 1990.