Heidi Hewitt has completed her Sheets Happen! series on the AutoCAD Sheet Set Manager. This tour through every aspect of Sheet Sets started with a diagram setting out the scope.
I made a MindManager version of it and added hyperlinks to the various posts as a reference. If you use I.E. this index will be shown in the continued post using the MindManager Web Viewer. Check out the series, there is some great information on the implementation and inner workings of sheet sets.