Federation of American Societies for Experimental Biology:

http://capwiz.com/faseb/mlm/signup/?ignore_cookie=1

Coalition for Life Sciences:

http://capwiz.com/jscpp/home/

Society for Neuroscience:
http://capwiz.com/sfn/home/

American Society of Pharmacology and Experimental Therapeutics:

http://www.aspet.org/advocacy/legislative-alerts

A whole list of Action Alerts updated by Union of Concerned Scientists:
http://www.ucsusa.org/action/alerts/
Research!America:
http://capwiz.com/ram/home/

AAAS: Human Rights action alerts:
http://shr.aaas.org/actionalert/index.shtml

American Society of Hematology:
http://grassroots.hematology.org/blood/issues/alert/?alertid=40438501&PROCESS=Take+Action

American Institute of Biological Sciences:
http://www.aibs.org/public-policy/news/action_alert_ask_federal_politicians_to_fund_science.html