I've written a small Java applet to let you practice counting down a deck. The first time it runs, it may be choppy (it has to download the image files for the cards), but it seems pretty smooth after that. You choose a time and the program shuffles the deck and displays the cards one at a time, so that the deck is complete in the time you selected.
Here is the link:
http://www.cardcounter.com/Counter/
Bug reports and suggestions appreciated,
--Eliot