I probably should have mentioned this a while ago, but coming up in about two weeks is the 2008
Simple Design and Testing conference. As with other open space conferences, the format is similar to Birds of a Feather (BoF) sessions and ranges from free-wheeling discussion to something slightly more closely approaching a presentation. Topics typically center around things like agile development and object oriented design. The conference is free and registration is pretty simple - write a wiki page called a "position paper" saying what you want to learn and/or contribute. Mine was
ErectorRubyRenderingLibrary.