I teach at a Hack Reactor, a dev training program, and this class' personal and group project periods are coming up. I've had a lot of fun suggesting ideas for them to work on and thought I'd open it up to the HN community. If you post here (or send an email to shawn@hackreactor.com), students will see your ideas/mockups/etc, and someone just might build it. Please include any/all of the following:
1. Your contact info & project description
2. Mockups/comps (it'll help a lot if you take 5 minutes to sketch a few screens with pen and paper)
3. Any info about built-in users (eg "I/my nonprofit/my soccer club will start using this tomorrow")
4. Any bounty that you'd like to offer
http://save-world.meteor.com/
http://graphe.me/
http://tsunani.com/