The website for the Law Librarians’ Society of Washington, DC is known throughout the law librarian community as a great source for high-quality research resources.  The Society’s Legislative Source Book contains all kinds of useful information for legal researchers.  The Society has just introduced another new site, "Legislative Histories of Selected U.S. Laws in Electronic Format."  The page is pretty self-explanatory; you can view the laws for which legislative histories are available by popular name or by public law number.  For details about accessing the information on this site, see the Society’s explanatory notes.  Thanks to beSpacific for highlighting this item.