Someone has probably brought this tool to the list's attention, but it floored me when I saw it in the flesh at Sears.
It's shaped just like a Campy seatpost tool (offset, in other words) with a 10 mm on one end and a 9mm on the other. The great part is that the ends are racheted, so once you get that 10mm on your seatpost bolt, you never have to take the wrench off until you're done adjusting the bolts (except to move to the other bolt, of course).
As we used to say in the bike shop biz, it's slicker than snot.
Sears Craftsmen double ended offset racheting wrench -- about $6.
Mike Hagburg
Bismarck, ND