BillPin is a Singapore-based bill-splitting service. The company now supports 40 currencies, including Bitcoin and beer. BillPin launched out of beta this past February and is available worldwide.
Using BillPin, friends can keep track of what they owe each other. This can include rent, travel reimbursement, the bar tab, etc. BillPin users can make transactions with each other through the service as well.
BillPin recently passed $300,000 in cumulative transactions and they have tracked over $20 million in shared bills. BillPin also has an iOS and Android app. The company acquired BillMonk this past April.