This contest is looking for apps designed for middle-schoolers that would be ready to beta test around the end of October. The submitting entity needs to be a small (<$500k in net revenue) non-profit, but that non-profit can be paired with a for-profit developer. The entering team keeps the game and the IP; the $20k pays for the time and effort involved in working with your assigned classroom doing the beta testing.
htttp://appsforclass.challengepost.com (no www)
Feel free to email me, firstname.lastname@example.org, if you have questions; I'm helping Innovate+Educate get the word out about this contest. Deadline is October 31. So far, there are fewer applicants than prizes :)