Let’s Move for the $40,000 Apps for Healthy Kids competition. Create innovative, fun and engaging web- or mobile- based games and tools that encourage children directly or through their parents to make more nutritious food choices and be more physically active.

ChaCha is a free mobile answers service, allowing users to call 1-800-2-ChaCha or text questions to ChaCha (242-242) on mobile phones and receive answers within minutes from real people. We've just launched our new API's, which provides you with free access to ChaCha's database with over 400...

To win this challenge, you must post a YouTube video of yourself consuming, nay, CHUGGING 26.2 oz. of mustard. Chugging = finishing in under one minute. The mustard must be poured into a clear measuring device in order to show the requisite amount. In this case, pour 30 oz. of mustard, as we...

 The NYC BigApps Competition will reward the developers of the most useful, inventive, appealing, effective, and commercially viable applications for delivering information from the City of New York's NYC.gov Data Mine to interested users.

Would you like to make a contribution of historical proportions? Here's your chance. This challenge is to create technology that can literally help to reshape our world, liberate hundreds of millions of people from repression, and bring down evil regimes in the process. There are few...

Update 10/02/09: Thank you very much for your participation in the Mozilla Labs Weave Web UI Design Challenge. The Weave team will go through the submissions in the coming days, evaluate, and discuss. Mozilla should finish this process by the end of next week, after which they will provide...