Counting coins by hand is lame; LEGO sets are cool. It only seems natural that a LEGO coin sorter would be a great way to solve the problem.
The design is incredibly simple and sorts United States coins without any alteration, but it can be modified to work with any other currency. If you have some spare LEGO lying around (and who doesn't?), this design can help you count your money without spending money to do so.
LEGO Coin Sorter [Instructables]