The Government Domain: A Handful of Classics by Peggy Garvin gives a good concise overview of some classic U.S. government websites. These are sites that she calls "classic" and that everyone should know. She links to the sites, provides a brief description and tells you the value of the particular site.
The introduction is also a useful brief overview of the rate of change on sites and the fact that many U.S. sites are not google friendly.
Ernster, the Virtual Library Cat
Above the Law - A Legal Tabloid - News, Gossip, and Colorful Commentary on Law Firms and the Legal Profession