Multnomah County Library's Social Issues Page
http://www.multnomah.lib.or.us/lib/homework/sochc.html

Librarians' Internet Index - Society and Social Science - Social Issues
http://search.lii.org/index.jsp?sm=fr10%3BSubTopic1444%3B00http%3A%2F%2Fwww.lii.org%2Fia%2Fdata%2Fdemo1%2Ftopic%2321713%3BSocial+Issues&moreres=SubTopic14

Public Agenda Online:  The Inside Source for Public Opinion and Policy Analysis
http://www.publicagenda.org

The National Center for Policy Analysis:  Idea House
http://www.ncpa.org
More EXCELLENT resources for  Social Issues:

The Opposing Viewpoints database is a great source!  Also, be sure to use the ProQuest database to find magazine, newspaper and journal articles about the social issue you are researching.  Any other subscription database listed under Social Issues / Current Events would be useful.  Also, use the library's catalog to find books on your topic - especially Opposing Viewpoints books.  Use the Encyclopedia of Associations (call number REF 061.3 Ency) in our reference section to learn more about an organization you are not familiar with or to find organizations involved in a particular social issue.