TeleNav "OnMyWay" app sends out alerts when you're running late1
Setting the app is a matter of taking care of a few simple steps. Enter your destination and expected arrival time, input a list of recipient's text or e-mail info, and you are then ready to hit the road. You can also add a personal message for some of the recipients and no one will know your location except yourself.
So no longer will you need to fumble for the phone to send out a text while you are driving, or curse at the traffic light for turning green while you are in the middle of writing out your excuse. Already available for the BlackBerry platform, starting today "OnMyWay" can be downloaded on your iPhone or Android phone for free from the App Store or the Android Market respectively.
source: AndroidGuys, TUAW