Here are some of the groups most effectively tracking some of the issues.
(This list is limited to issues which the U.S. Congress has substantial involvement with.)
I've just re-organized the topic list. It will be filled in soon.
There are a lot of sites encouraging you to take their stand. This list concentrates on the fewer, partisan or not, just keeping you up to date.
The number of links in an area reflects the quantity available so far, not the area's relative importance. Please email us with any suggestions, additions or comments.
Active Legislation in the Senate updated at least weekly
news sources with a lot of political coverage (not exhaustive!)
keyword search of 30 Million Government Web Pages
GPO Access Online A-Z Resource List and Description of Databases Online via GPO Access
This doesn't have a good niche on this page, but I really had to mention the Highlander Research and Education Center, where people such as Rosa Parks learned organizing.
Democracy for the few, by The Email Activist
Campaign Finance Clearinghouse searchable database
Public Citizen Campaign Finance Reform
Common Cause Election Reform
Yahoo News Education
Yahoo News School Vouchers
Department of Education National Center for Education Statistics
Department of Education “The nation's Report Card”
Public Citizen Critical Mass Energy and Environment Program
The League of Conservation Voters Home,  Campaigns, Take Action page
Environment, The Email Activist
Black rhinoceros link list
Worldwatch Institute (definitive background research)
Public Citizen Global Trade Watch
Legislationline from the Office for Democratic Institutions and Human Rights (ODIHR) of the Organization for Security and Co-operation in Europe (OSCE), and the European Union
The New Global Economy  by The Email Activist
International Forum on Globalization (background and current -- not up-to-the-minute)
The Globalization Website Data Sources
Harvard University Global Trade Negotiations Home Page
Public Citizen Health Research Group
Common Cause Rx Pricing
listed under “Women's Issues”
Senate Committee on the Judiciary
Nominations (still listing last Congress)
Members link page
Common Cause Information is everywhere.
mediachannel.org's latest news, and recent archives on Ownership, War and Peace Monitor, and, less reliably, "Mediaocracy"
Ownership information (changes rapidly!)
Columbia Journalism Review Who Owns What (broadcast stations)
Center for Public Integrity Searchable Ownership Database only has lists, not sizes
"Big Ten" as of (12/01)
Media Giants as of (2/01)
One of the most important scholars and critics of the grand consolidation is Robert W. McChesney, who also has a good links page.
National Security The Email Activist
"The Fainthearted Faction" of Democrats supporting Social Security "reform"
"The Conscience Caucus" of Republicans opposing Social Security "reform"
SOCIAL SECURITY CRISIS!: The FAQ! from fafblog
Current Action Alerts
Drug Policy Alliance / Action Center / Foundation / Lindesmith Foundation ; Library & Library search
Take Action / Sign Up
NARAL Hub Homepage / Federal Legislation / Legislative Action Center / Save the Supreme Court - Rapid Responder / sign up for the Choice Action Network
Catholics for a Free Choice What's New
The Propaganda Mill from The Email Activist