Just curious: I am currently trying to think of an application that's really worth building. Google comes up with the following list for their contest:

• Social networking
• Media consumption, management, editing, or sharing, e.g., photos
• Productivity and collaboration such as email, IM, calendar, etc.
• Gaming
• News and information
• Rethinking of traditional user interfaces
• Use of mash-up functionality
• Use of location-based services
• Humanitarian benefits
• Applications in service of global economic development
• Whatever you're excited about!

But these just look like every day apps, not truely innovative. Anyone has a better idea?