it's basically a form of outlining by visually mapping out every possible avenue you want your concept to take, you strike me as an Apple kinda guycheck out MindNode for iOS.this post in Organix is interesting, been doing some research on some of these systems: http://board.okayplayer.com/okp.php?az=show_topic&forum=32&topic_id=169&mesg_id=169&page=*paging dapitts08*
here for dis.