Posted By:
Eric BrehmI have only cracked open a few, but here is the method I have used, without causing injury to either myself or the card:
(1) Break off a corner of the slab with a pair of pliers. Some plastic shards may fly off when you do this, so wearing eye protection is a wise precaution.
(2) You can now insert a screwdriver a short distance into the slab interior and work it around the outside edge until the top and bottom halves separate. Be very careful not to jab the screwdriver into the card.
Also see this article:
http://www.seanet.com/~brucemo/card_articles/deslab.htm