Google Immigration and Greencard Forum
http://groups.google.com/groups?hl=en&lr=&safe=off&group=misc.immigration.usa

Immigration Links
http://www.immigrationlinks.com/

Atlantic Monthly Immigration Resources
http://www.theatlantic.com/atlantic/election/connection/immigrat/immigrat.htm

Center for Immigration Studies
http://www.cis.org/

International Center for Migration, Ethnicity and Citizenship (ICMEC)
http://www.newschool.edu/icmec/

University of California Migration Dialogue
http://migration.ucdavis.edu/

U.S. Commision on Immigration Reform
http://www.utexas.edu/lbj/uscir/