The humble To Do list has been updated, with the Dunnit! iPhone app using gaming-style achievement points for every task completed. Sure beats scribbling on the back of an envelope I guess, though it'd be better if they translated into redeemable points.
Having some sort of incentive to tick off every task on the list would definitely make me more pro-active, especially if you could translate them into iTunes gift cards or something. Though at $5.99 a download, the developer Runloop would have to be raking in a lot of downloads for that to make financial sense.