Several government agencies and universities have created comprehensive web pages which allow you to access the various government sites from one starting place. The following are among the best:

Agency Index
Courtesy Paul A. Arrigo, Washburn University School of Law.  A web page for Federal agencies that provides links to the agencies' homepage, publications, organizational charts, electronic forms and administrative decisions. Often this information can only be found by digging deep into an agency site.

Federal Agencies and Commissions
Maintained by the Bush White House, this is an alphabetical list of independent agencies and commissions with website links.

FedStats
Provides access to statistical data from over 70 federal agencies and the latest White House press briefings.

Federal Web Locator
From the Center for Information Law and Policy, this site provides links by branch of government, official and quasi-official agencies, government servers and much more.

Infomine
University of California Riverside's Government Information Web Page

Library of Congress
Includes historical documents, copyright information, reference and interlibrary loan information as well as access to the LC catalog.

Pathway Services Browse Topics
Subject-specific guides being developed in partnership with the GPO to direct librarians and the public to Federal government information on the Internet. 

GPO Access
The Federal Register, Congressional Record, Congressional bills and other Federal government information are available online via GPO Access, a service of the U.S. Government Printing Office (GPO). Public access is available through the Federal Depository Library, or directly from GPO. Provides access to the current Guide to U.S. Government Information, also known as MoCat.

CSUSM Government Information Home Page