Federal
The Law Making Process - A slightly long and rather extensive guide
http://thomas.loc.gov/home/lawsmade.toc.html
Glossary of Congressional Terms
http://www.senate.gov/pagelayout/reference/b_three_sections_with_teasers/glossary.htm
How to Schedule of Meeting with your Representative or Senator
http://usgovinfo.about.com/od/thepoliticalsystem/a/meetreps.htm
Representative Offices
http://www.house.gov/house/MemberWWW.shtml
Senators Offices
http://www.senate.gov/general/contact_information/senators_cfm.cfm
Research Tools
C-SPAN - Votes Library
http://www3.capwiz.com/c-span/dbq/issuesdbq/votesearch.dbq
Open Congress - Track by Bill, Senator, Representative or Issue area
http://www.opencongress.org
Contacting the Congress
http://www.visi.com/juan/congress