Legislative:

• Biographical Directory of the U.S. Congress, 1774-present
• Congress.org
• Congressional Documents and Debates, 1774-1875
• Congressional Record (scroll down list)
• CRS (Congressional Research Service) Reports (Selective from 1990)
• CRS Reports (Homeland Security/Terrorism and Health Law & Policy)
• Congressional Votes Library
• How Our Laws are Made
• Legislative Branch Internet Resources
• Legislative Branch Resources on GPO Access
• Project Vote Smart
• THOMAS: Text of Bills, Public Laws, Committee Reports...
• U.S. House of Representatives Committees
• U.S. House of Representatives Roll Call Votes
• U.S. Senate Committees
• U.S. Senate Roll Call Votes
• Votes Database: Every Congressional vote since 1991

Executive Branch:

• White House
• American President.org: History of the American Presidency
• American Presidency Project
• Presidential Directives and Executive Orders: Unofficial Site
• Presidential Libraries
• Presidents of the United States: From the Internet Public Library
• Public Papers of the Presidents: Hoover through Clinton
• Statements of Administrative Policy on Non-Appropriations and Appropriations Bills

• Court Forms (FindLaw)
• Federal Courts Finder
• Supreme Court of the United States
• Supreme Court Opinions: 1893 to date
• U.S. Courts: Federal Judiciary

Regulatory Agencies:

• Code of Federal Regulations
• List of CFR Sections Affected
• Regulations.gov
• Unified Agenda (Semiannual Regulatory Agenda)

• American FactFinder: 2000 Census Data
• Blue Pages: Federal Government Directory
• Catalog of U.S. Government Publications 1976 - to date
• Consumer Price Indexes
• Core Documents of U.S. Democracy
• Decennial Censuses of Population & Housing: 1790 to date
• Directory of Federal Depository Libraries
• Federal Business Opportunities (replaces Commerce Business Daily)
• Fedstats: Federal Statistics
• Federal Agencies Directory
• Forms from the Feds: U.S. Government Agency Forms
• GPO Access
• Historical Census Browser: 1790-1960
• Historical Statistics of the United States: Colonial Times to 1970
• Patents - Full Text of US Patents
• Statistical Abstract of the U.S. (current)
• Statistical Abstract of the U.S. (selected previous editions)
• Tax Forms and Publications from the IRS
• U.S. Government Online Bookstore
• USAGov: Portal to United States Government Information
• United States Government Manual

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Thanks to the librarians at Stetson University for most of these suggestions.