If you play Mafia Wars on Facebook you may ask yourself a question - "what is the best investition to my Mafia money right now" ? You could calculate money-to-profit factor for every property manually and get the answer but.. why bother so much?! That's supposed to be fun right?
Here is simple bookmarklet solution - just drag Mafia ROI link to your bookmark bar and click it when you look at your Mafia Wars properties. It's easy. You'll get ROI factor calculated automagically for each and every available property and undeveloped space.