I've heard the Houston AMSAT Net sends slow scan television pictures as part of its regular proceeding. Is this unique to them or are there other examples out there?
Appleton WI http://www.apleinc.com/WB9KMW/SSTV_2M.html
Columbus OH http://www.qsl.net/n/n8tut//sstv/
Sacramento CA http://www.n6na.org/nets/sstv-net
And, a 2005 list, some of which are sure to be active still http://www.hffax.de/html/net.htm