The Early Show featured a brief segment this morning called High-Tech Rattles. They demonstrated an iPhone with a rattle app, a G1 with a white noise app and the Blackberry-esque LeapFrog Text & Learn.
It seems like a handy idea, using an iPhone app to placate fussy babies. But do you even need a special app? I'm betting that your child will find plenty of amusement calling the random ex girlfriends you still have saved in your address book (for reasons never quite adequately articulated to your spouse/the mother of your children). I know I would.