Black Box Backlash by George Howland Jr.:

"Voting on a touch screen is like using a bank's automatic teller machine. There is one vital difference, however: The voting machine does not give you a paper receipt. The absence of a paper trail has alarmed a variety of people, including some of the nation's most renowned computer scientists. Their bottom line? These machines could be hacked. The solution? An auditable, voter-verified paper trail."

Why couldn't a voting machine give you a paper printout which you check and then deposit in a box? Just in case the Supreme Court decides to do things right next time around...