The 2010 Calling All Innovators contest features four categories for application submissions:

Eco/Being Green
Like its name implies, this category challenges developers to help save the planet with innovative, eco-friendly applications for use on Nokia devices.

Entertainment
Here’s your chance to submit apps that rock, and show off the coolest multimedia features that are available on the latest Nokia mobile devices. This includes music, multimedia and games.

Productivity
This category seeks mobile applications that make consumer’s daily lives easier and help them to be more efficient, such as utilities, business, or personal finance applications.

Life Improvement
This category seeks applications that positively affect the daily lives of people living in developing countries, and may include education, agriculture, health and more.

This year, the contest also has a fifth category that truly stands alone:

Growth Economy Venture Challenge
Nokia’s Calling All Innovators competition has always been about trying to find the best big ideas for mobile applications from developers around the world. This year, Nokia is taking that desire to find big ideas to a whole new level.

Local content opportunities
Additionally, a number of countries will be offering prizes for the best submissions that are localized to the needs of consumers using Nokia devices in that country.