So many ideas...so little time

I'm currently designing a couple of Iphone/Ipad apps.  What should an app really do...fix a problem, make life easier for people?

In a way I think its the form of invention that designers and developers strive to create.
Over the past, we have seen games such as 'Draw Something' and photo applications such as 'Instagram' sell for and produce millions.

Sneak peak of the wire frame.