Apple's App Store recently surpassed 500,000 applications, and Google's Android Market is quickly catching up with around 400,000 apps. With all of these apps, it's hard for users to find those they really want and like. In most app stores, the apps that get the most exposure are the apps that are already popular: In fact, digital marketing and advertising agency DigiDay found that 36.2 percent of users only look for apps on a mobile phone's home screen, while just 27.6 percent look in the app stores for new apps. How can this problem be solved? FierceDeveloper takes a look at some of the major players in app discovery, highlighting their strengths and weaknesses. Special Report