When you live in Washington DC, you go out to eat a lot. There are so many great restaurants and eateries. Inevitably, the dinner bill comes and everyone sits around trying to figure out how much tip they should add on.
The problem is now solved with my iPhone. With the Web app Tipr (http://www.tipr.mobi), you just enter the dollar amount, the percentage of tip you want to give, and it will say how much tip you should pay. This is all done in an iPhone optimized environment.
I will be using this app.