Open Space Technology is a very open, low-resource way of running a conference.
Worldwide web site: http://www.openspaceworld.org/
"The" book (there are many books): http://www.amazon.com/exec/obidos/ASIN/1576750248/
Lisa Heft - http://www.openingspace.net/ (she also posted some things on the Meatball page below, which is itself also pointful)
From other wikis: