The Green Flight Challenge is getting close:
Embry Riddle Begins GFC Test Flights - CAFE Foundation Blog
Latest Details - Sample Return Robot Challenge at WPI gives an update on the final rules, team agreement, and registration.
The X PRIZE Foundation and LEGO Group Announce Global Student Team Winners of MoonBots 2.0 Challenge - Google Lunar X PRIZE
Creating a Collaborative Nano-Bio Manufacturing Institute - Challenge.gov - This is for the Air Force Research Lab.
Competition Provides Solution for Stopping Uncooperative Vehicles - OSTP Blog
08/26/2011: Update - SpeedUp
The NASA Tech Briefs "Create the Future" Design Contest winners should be announced this month.
UK contest for student space settlement design - Space for All
The Hubble Roadshow - update and contest - Space for All