BillMonk is a new service that allows people to track IOUs (I Owe You) between friends.
For example, if A and B have a meal on an AA basis and I pay the 100-dollar bill (so both A and B should bear 50 dollars respectively); and another time when A and B drink coffee together and B pays the 16-dollar bill, BillMonk will automatically calculate that B owes me 42 dollars.
Is this service useful for us?