Spaceref has a press release on the 2008 NASA Aeronautics Competition:
The contest asked students to create a future subsonic transport aircraft that could carry up to 50,000 pounds, operate on runways between 1,500 and 3,000 feet long, and cruise at speeds between 595 and 625 mph - about the average speed of airliners today. The competition also stressed that concept planes should use alternative fuels and be quieter and more environmentally friendly than today's commercial fleet.
A new competition is expected to be kicked off in a couple months. Here are the University level winners. Georgia Tech won the graduate level competition and Virginia Tech won the undergraduate level competition.