Department of Health and Human Services
Extensive list of downloadable forms. There is also an interactive form site called Intelligent Forms which uses JetForm Filler (the site for downloading this application is linked).
Department of Justice
Forms and instructions for the various offices and agencies of the Justice Department.
Department of Labor
Forms from ERISA (Employee Retirement Income Securities Act).
Department of Veterans Affairs
Forms are divided into subject categories. A search engine is included.
Food and Drug Administration
Extensive collection of forms.
Health Care Financing Administration
Contains HCFA program forms.
National Institutes of Health
Several forms are available which are used for research activity involving human subjects.
National Science Foundation
Grant proposal "kits" are available for downloading which include forms. This excellent site also contains manuals for help in writing and preparing grants.
United States Courts Bankruptcy
Official Bankruptcy Forms available using Adobe Acrobat.