Seventh-day Adventist (or related) Discussion:
J.R. Layman's Adventists of Tomorrow -- The precursor to Adventists for Tomorrow
SDAnet.org -- Member-operated SDA media organization in operation since 1990 -- runs many mailing lists (http://sdanet.org/listman.cgi) -- Maintains an archive of 20 years' worth of online discussion
CARM.org's SDA Forum
Tom Norris - All Experts.com -- Tom Norris is an advocate for Adventist Reform