I know I'm not the first to do this, but after a discussion at our local users group I put together a tutorial for creating an automatic index that gives the user control over how the sheets are ordered. Prior to going through this process, the automatic sheet index and browser will only list the sheets in alphabetical order.
The attached tutorial shows how to create a sheet index which automatically references all your drawing sheets and divides them by discipline not only in the index but in your browser window as well. The index automatically updates as you add or delete sheets.
Enjoy!