Write the United States House of Representatives:

https://forms.house.gov/wyr/welcome.shtml

Writing Texas Legislators:

http://www.tasb.org/issues/sban/handbook/communicating/writing.aspx

On-line directory for the 110th Congress:

http://www.visi.com/juan/congress/

Contacting Congress (& Other US Policymakers):

http://w2.eff.org/congress/

Contact Elected Officials:

http://www.usa.gov/Contact/Elected.shtml

Write Your Legislators:

http://www.leg.state.or.us/writelegsltr/

California - Find your Legislators:

http://www.leginfo.ca.gov/yourleg.html

Write an effective Letter:

http://www.nea.org/lac/writing.html

Washington State - Find your Legislators:

http://apps.leg.wa.gov/DistrictFinder/

Write your legislators:

http://www.wright.edu/nursing/healthpolicy/module5.htm

Writing a letter to your legislator:

http://www.psychlaws.org/GeneralResources/advocates_ltrleg.htm