No, I'm not exactly sure how it would work and I wouldn't want to see some spin off site that competed with Less Wrong. It is a possible resolution to the difference of opinion over expanding access to this site vs. 'dumbing down' the content. I would imagine the sites would serve overlapping but different purposes - a RationalityOverflow could be a place for people who might be intimidated or turned off by Less Wrong for other reasons to ask rationality themed questions. It could serve the role of the site we point people to do for answers to basic questions that they are expected to grasp before participating here. Not that it should only be for basic questions.