I have two divided trays (think of a floss box, only larger) to use and think sorting by nearest eighth-inch (into 1/4" and smaller, 5/16" & 3/8", 7/16" & 1/2", 9/16" & 5/8", 11/16" & 3/4", 13/16" & 7/8", 15/16" & 1") would be nice, but the tool I'd use to help sort, a Staedtler circle template (the top item on this page), is in Colorado and I'm not.
I am wondering whether it'd be more efficient in the long run to replace it or do simply draw a template in Illustrator and print it.
edited to add: I put a .gif copy of the template I drew up in my LJ photo space at http://pics.livejournal.com/oddharmonic/pic/0002ahyx/ .