Political Action Committees - sponsored by the Center for Responsive Politics; the site provides a PAC search engine, information about how much money was given to PACs, foreign-connected PACs, PACs by industry, top donors, and donor look-ups. Special feature: search donations by zip code.
American Association of Retired People - the AARP is recognized as the leading voice for older Americans, regularly monitoring the concerns and opinions of its members and drafting legislative policy that reflects those concerns.
Center for Democracy and Technology - this group's mission is to develop public policies that preserve and advance democratic values and constitutional civil liberties on the Internet and other interactive communications media. This interactive site encourages you to sign up to be a watchdog and lobby your member of Congress.