Council of State Governments
http://www.csg.org
Research publications and public policy strategies.

National Conference of State Legislatures (NCSL)
http://www.ncsl.org
Information network for and about state legislatures. NCSL products and conferences. Links to state legislatures and public policy resources.

National Association of Counties (NACo)
http://www.naco.org/naco.htm

National League of Cities
http://www.cais.com/NLC

Stateline
http://www.stateline.org
State developments, extensive archive,background