A simple application that reverses the usual scrolling practices on Mac OS X 10.5 and above to mimic those of the upcoming 10.7 Lion OS and iOS. Been using it for five minutes and I'm already used to it.

"Being sedentary for nine hours a day at the office is bad for your health whether you go home and watch television afterward or hit the gym. It is bad whether you are morbidly obese or marathon-runner thin. 'Excessive sitting,' Dr. Levine says, 'is a lethal activity.'"