Government information covers an extremely wide range of topics.  Depending on your subject, a good starting place might be the list of all theOhioLINK Research Databases.

Recommendations:
CIS Congressional Universe  (legislative information--bills, reports, members of Congress, and more)
PAIS(Public Affairs Information Service)
SIRS(Social Issues Researcher)
Ohio Capitol Connection (Ohio legislation and government information)
 

Government Sponsored Databases:

Many government agencies have designed public access databases. 
Selected Indices to Publications of Federal Government Agencies (Compiled by Univ. of Nevada - Reno)
    NOTE:  Good overview of databases available to the public

Sample government databases:

DOE Information Bridge (Department of Energy)
Department of Defense Index of Specifications and Standards
GAO Reports Online (via GPO Access)
Energy, Science & Technology Information Resource