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"After an initial test marred by computer pranksters, Stamps.com and the U.S. Postal Service are again offering people a chance to put their personal photos on postage stamps.
A new one-year test period will begin on May 17, the Santa Monica-based company said Tuesday. Stamps have also been redesigned to provide more room for images, with a sheet of 20 first-class stamps selling for $16.99."
-- Business Week
Update: A wonderful article on fake stamps as art, from Stay Free Magazine.
Earlier:
Advertising on Stamps