This app makes it so simple to split up a check according to what people actually got.
2 features would make it even more amazing:
1. OCR support so that you could take a picture of a receipt and just assign the items to people
2. A way to adjust the total to account for discounts or additional taxes that are applied to the subtotal and still have the tip percentage applied to the subtotal.
Kleerwater about Billr: Bill Splitting at the Table