For developers who think their app is the best, you may want to get your entries into Red Gate's software competition (supported by Microsoft, evidently).

The contest is simple: 

Write an app. Get it onto the Marketplace. Create a screencast tagged #WP7COMP. Then create your competition entry here. You could win $10,000. And your app's still yours. Three judging panels will each be asked which app will developers love most? The one they choose, wins.

Three panels = Three prizes = $30,000 total prize money.

Seems like a simple enough plan. The deadline for entry is February 28th, so get cracking. Go here for the site: and make sure you read the Terms & Conditions, just in case.