Ex-Pentecostals is a specific group catering to walkaways from the "Avengelical"/"deliverance ministry"/"spiritual warfare" flavour of dominionist group:

http://www.ex-pentecostals.org

They do have an EZBoard web-board and one of the sub-boards, "Azusa Street Survivors", is particularly relevant as the people there post info on dominionist groups that are often inaccessible save *from* walkaways from those groups (and is a good spot for even non-walkaways to get intel on those groups).

For those of us who are walkaways from dominionist groups, there are five private forums (that one must write a moderator for access to) for general recovery, ex-dominionist Christians, family members and friends of walkaways, "freethought" walkaways (pagan/Buddhist/atheist/eclectic/etc.) and kids who are walkaways.