http://www.game-ntz.com/anorphous/clock.html
This clock is much more importaint
http://www.chasebrown.com/olson.htm
This analogic one’s much nicer:
http://www.lares.dti.ne.jp/~yugo/storage/monocrafts_ver3/03/
You can buy a binary clock here: http://www.thinkgeek.com/cubegoodies/lights/59e0/
Is cool. But not very useful.