Stopped by my LBS and was asking about how to size a new saddle. The owner pulled out a Bontrager saddle sizing device that I didn't know existed. Sit on this thing and it shows your sitzbones impression and, using some sort of sliding scale thing, tells you the width of the saddle that fits you. Very cool. Mine measured at 115 which translated to a 146 saddle according to Bontrager. Now to go measure my current saddle.