Kopa Housemate Finder - Find furnished apartments and housemates for 1+ months
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!
Dwell - A social network for the design-obsessed
/Tab - The simple way to split a bill among friends.
HomeSlice - Mobile App Roommate Dashboard (chores, expenses, etc.)
Dinngo - Splitting payments the fun and easy way