When you are playing the game save all your money until the other player has bought all the property and buy them off him for whatever he wants just make sure you have money left over.when you have done that, manage your properties and it will give you a special icon click that icon and it wll give you 1 million dallars every time you click it.
Exit and return to the iPhone or iPod home screen when you have rolled the dice and see that you will be on a property where you will have to pay rent. When you reopen the game and resume the session you will be on that property and still have ALL your money. This trick can also be used to avoid the effect of landing on 'Chance', 'Community Chest' and 'Go To Jail'.
Whenever it looks like a loss is inevitable simply exit the game and return to the iPhone or iPod home screen and start a new game and the old game will not be counted as a loss (do not use the in-game menu to exit the game otherwise it will be counted as a loss).