A good and successful app needs the right ingredients: a cool UI Design, application logic, great backend, and killer features to disrupt the market. We have often discussed the importance of a good design. For a programmer, the application logic, great backend, and killer features are aspects that can be taken care of. The design should be a non-programmer role, leaving it to the guys who know it the best. Throughout the book and various apps, we have tried to get the best design (legit, or open source, or creative commons images) that fits our app requirements, based on excellent communities, such as http://www.dribble.com, http://www.365psd.com, and the holy grail of design on the web - http://www.smashingmagazine.com.