Seriously what ericb said, milk the app store and advertise your apps online if you can, keep it going but the investment climate is lame everywhere.  I am now in the same situation where I had 30k cash for the first time with no debt and I essentially put it in a safety deposit box at the bank so I won't spend it.  If you look at money market, CD's etc, they all stink right now so just lock it up.<p>If you have not bought a house yet then I would look into doing that and taking advantage of the 8k tax break for first time home buyers.  Sounds like you have enough down payment to cover 20% and get out of the PMI insurance.<p>You might use that money to hire another developer you can train and crank out more apps, and hit the android market as well.