1) Creativity: Find A New Use Case.
Don't just create another wallet (unless it has a new twist!) We want to see apps that make bitcoin easy to use, and show off new use cases that aren't possible with existing payment methods.
2) Usefulness: Make Bitcoin Easy To Use.
We're looking for apps that make bitcoin more approachable for a mainstream audience. How can bitcoin go viral, or reach 100M new people in the coming years?
3) Execution: Pay attention to details and functionality.
We're looking for apps that work well. It should be clear that you care about providing a good user experience, but we're not requiring polish or perfection.
For some ideas on what to build, see this blog post.