Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
Grover - Rent electronics for a month & try it before you buy.
Splittable - Shared living made simple
Shelf Engine - Vendors get paid for only products they sell
EquiTable - Split the bill fairly
Nespresso Index - The caffeinated version of the Big Mac Index.