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Scott Forrestbut then I'd have to kill you.
oh, okay - the basic key is having a good color printer and choosing the appropriate "card stock" (8.5 x 11). Duplicate the bitmap image so that when you print a sheet you can simply cut between the images and have the correct amount of border. Try it with b&w draft mode until you get it right.
Photographic thick-stock cards like OJ's are trickier and involve gluing photographic sheets to thicker stock before cutting. Most important: Be careful playing with sharp objects.