The Allen Sides' Ocean Way Microphone Locker App is a great way to learn about microphones and their application in various recording scenarios. The app is based on Allen Sides vast knowledge and extensive mic collection at his famous Ocean Way Studios.
Take a look at this video featuring Steve Vai giving an overview of the Microphone locker App:
Currently available for iPhone/iPad. Hopefully the app will be made available for Android soon.
Download on iTunes.