I think you players of Mafia Wars will find this very useful. If you ever wondered what to buy next for your mafia, my excel table will tell you. It calculates the current earning power of the properties you can buy and suggests for you the one with the highest income-per-cost-ratio. Try for yourself.
If you care and fill in carefully all your inventory aswell, it will give also a nice overview of your incomes and upkeep.
Download Zababa's Mafia Wars Expense Guide. The Excel Table contains few lines of text as user's manual. If you have further questions write me an email or comment here.
Update: I no longer play Mafia Wars. If you like you can modify my sheet or add some tables for Cuba. Just keep my name in the credits. Don't send me Mafia Wars requests any more.