Guess I'll be hunting for a centre punch too ...
You can get one of them at any decent tool dealer (or any non decent
dealer that sells more then 4 plastic handled screwdrivers).
A center punch's "true" purpose is to mark or ding items. ie: before
drilling a hole in a metal sheet, you can use the center punch to ding
the metal so the drill bit won't slide around as it gets started.
They are really handy for breaking tempered glass cleanly. (just never
use one on your leg, as I found out the hard way... it hurt so much I
thought I exploded my femur).
-chris
<http://www.mythtech.net>