The difference is that existing programs require the user to correct each word individually from a drop-down list of alternatives, or else to retype or reutter the words.

ECONOMIST: Monitor

Starting in 2002, receipts from user fees began to drop significantly, thanks largely to the impact of a slower economy and increased sales of gasahol, an Ethanol-based fuel that isn't taxed for the Highway Trust Fund and is heavily subsidized--thanks to the farm lobby and the efforts of Archer Daniels Midland (nyse: ADM - news - people ).

FORBES: Magazine Article

Suppose a player were to break his arm during the contest, a user can trade their units in that player, but the value of the units will drop if everyone tries to sell them at once, emulating a stock exchange.

FORBES: Scramble For Cutting Edge Fan Participation Continues