Just over a month ago, the Library of Congress launched a new website, www.congress.gov, in conjunction with the legislative branch and the Government Printing Office. If you're in need of government documents (e.g., House and Senate Reports, the Congressional Record) in pdf form and dating back to 2001, make this your first stop.
Following suit, the Law Library of Congress has revamped its website to make searching easier. Now you'll be able to troll your favorite Law Library of Congress collections---like the digital archive of legal blogs (a.k.a. blawgs) and the Global Legal Information Network---faster.
Curious to see what the states are up to? This site recently reviewed and ranked the 50 U.S. States Websites according to design and access. This site recognizes notable government websites based on "innovation, functionality and efficiency."