In case the little light didn't tip you off, the credit card being held by Jeff Mullen, the founder of Pittsburgh, Pa.-based Dynamics Inc., isn't just a credit card. It's a super-thin computer. The card itself can change information on the magnetic stripe to mimic other types of cards. Want to use reward points instead of credit? You can operate the card to do so. Dynamics showed off its E-Plate card at Demo two years ago and walked away with a $1 million check. Since then, however, it has raised tons of money and the backing of some of the nation's biggest card-issuing banks, such as Citi and UMB. It presented an update as a featured alumnus of the Demo event.