Thought this could be generally useful, it's a list of most of the seemingly "alive" left groups and or parties (non-anarchist) that are in the US. I really didn't need this as a text file on my computer anymore so I figured I'd dump here. Could be useful for mapping the Left.
http://www.peaceandfreedom.org/home/contact-us/local-organizations
http://www.pslweb.org/party/join/
http://www.socialistalternative.org/about/
http://www.socialistaction.org/contact.htm
http://www.solidarity-us.org/site/branches
http://www.workers-party.com/index.php?option=com_content&view=article&id=57&Itemid=70
http://www.themilitant.com/direct.shtml
http://www.spartacist.org/events/index.html
http://www.internationalist.org/
http://americanpartyoflabor.org/contact-us
http://www.cc-ds.org/contact.html
http://www.dsausa.org/about/localinfo/locals.html
http://www.socialism.com/drupal-6.8/?q=node/7
http://www.slp.org/directory.htm
http://en.internationalism.org/contact/postal
http://www.leftcom.org/en
http://internationalist-perspective.org/IP/ip-index.html
http://www.plp.org/more-info/
http://www.socialistappeal.org/contact-wil
http://www.usmlo.org/
http://wspus.org/about-us/membership-application/
http://www.thelaborparty.org/a_contac.html
http://www.gp.org/states.shtml
http://www.cpusa.org/join-us/#theJoinForm
http://www.revleft.org/wiki/index.php/List_of_Left-Wing_Parties_in_the_United_States
http://www.revleft.com/vb/political-organisations-t27951/index.html



Can comment on articles and discussions
I'm curious what experience folks have with some of these groups? I'm particularly interested in some of the medium sized leftist groups that have a geographic presence beyond the key leftist hotspots (like the bay area, New York orChicago) but aren't as big as, say the ISO or SPUSA. Groups like Socialist Alternative, PLP, the FRSOs or PSL and WWP.