OpenSpace Technology is a conference format in which participants do most of the planning at the conference itself. It was developed by HarrisonOwen and others out of the observation that many people get the most from the time outside the pre-organized panels.
See also: UnConference
See http://www.wiki-thataway.org/index.php?page=OpenSpaceTechnology and the Open Space wiki - http://www.openspaceworld.org/wiki/wiki/wiki.cgi