Registration is now open for the third annual O’Reilly Mac OS X Conference, being held October 25-28 in Santa Clara, Calif., where “Mac developers, sys admins, digital musicians and users can master the must-have tools and goodies that Apple and other companies are churning out in the wake of Mac OS X’s success.” Conference participants include Stewart Copeland, the former drummer for the Police who now creates award-winning film and television scores using Mac OS X technology; New York Times columnist David Pogue; Andy Ihnatko of the Chicago Sun-Times; Karelia Sofware’s Dan Wood; Brent Simmons of Ranchero Software; Michael Bartosh of 4AM Media; and authors Dori Smith, Gordon Meyer and Ted Landau.