Billmonk is a web utility that lets you and your friends track who owes who $15 for chinese food, who has your Donnie Darko DVD you lent out 3 months ago, how much your best friend bet you that you wouldn’t win the next beirut game, and all sorts of little debts that get lost in the shuffle. It’s even interfaceable with Facebook! Plus, you can add things to your personal library that your friends can view and see what they might be able to borrow from you. Mad useful.

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