New York City likes to put out its BigApps challenge to get developers to come up with apps that make living in the city better. ( Recent winners include parking finder and pick-up game organizing apps). But the city is now trying something different with its BigApps Ideas Challenge . Instead of asking developers for apps, the challenge is asking for problems that can be solved with apps. Anyone can submit a problem they want solved, and the best ones will get voted up. The challenge is hosted on ChallengePost , and there are cash prizes of $100 for each of the top 50 ideas, and $250 for each of the top 10.