A great site to search for government publications. For a specific search use the Catalog of US Government Publications' link, for the most recent documents use the 'New Electronic Titles' link.
A web-based guide to Citing Government Information
Good topic search for government info.
A comprehensive list of online Government Documents.
Clear list of historical material making up U.S. civic life.
A-Z list of government information. Easy to scroll through.
A simple yet great site to learn about branches of government, constitution, and more.