"Money transfer applications, location-based services and mobile search will reign as the top mobile app categories by 2012."
-- Gartner Research
BD Commentary: Research shows that game apps, augmented reality apps, GPS turn-by-turn navigation apps, and content directory combined with a phone module apps are some of the money makers in the app store. Keep that in mine when you're thinking about what kind of mobile app to develop. We also recommend you consider other devices and other platforms outside of Apple and the app store. For developers really looking to make money the best approach I've seen is the MEDL Mobile model, which is basically building apps for companies and individual consumers and either getting paid off the top or for each download.