Cool.. My bet if you look around you'll find a bunch of ideas. Talk to friends, strangers etc and just ask what's frustrating them etc.

Since you are interning go and talk to the sales, marketing and business dev teams and ask them questions. As an intern you have the freedom to ask all kinds of questions and no one will really think twice. Just try to get away from the development group when you are asking a lot of the questions because they typically aren't seeing the opportunities only the items presented to them, and many times their presence will keep sales teams from speaking freely.