Back when I shared an apartment with roommates paying the bills was a haphazard affair. Each month somebody had to step up and play the role of "accountant," the guy who tracked all the charges and hounded each roommate to pay up. In our place that guy was always Mike. He would have wept with joy over Billshare, an online service for roommates (or any other group of people) who pay bills collectively. Users can create receipts, track spending habits, and send out email alerts to their roomies. Sign up is free. If you share bills with someone, this program might make your life a whole lot easier. Do it for the Mike in your life.