Sabrina I. Pacifici posted a link to great resource on her blog, beSpacific

The American Library Association has posted the Best Free Reference Web Sites 2004.

The sixth annual list was complied by the Machine-Assisted Reference Section (MARS) of the Reference and User Services Association (RUSA) of ALA. Add this one to your favorites.

Most of these are not law-related websites. Some like the U.S. Copyright Office are law-focused content.  It is important for lawyers to appreciate the power of factual research on the Internet, not just legal research. Lists of properly vettted authoritative databases should be treated like the gems that they are and saved to your bookmarks or favorites. You never can tell when you will need to quickly find the ingredients of common household products or locate in-depth information about the Federal Reserve System.