I'm passing along this information from Bill Ledbetter:
Baen Books and The National Space Society applaud the role that science fiction plays in advancing real science and have teamed up to sponsor a short fiction contest in honor of Jim Baen and focusing on the near future of manned space exploration. Winners will be intelligent and entertaining stories about topics including Moon bases, Mars colonies, orbital habitats, space elevators, asteroid mining, artificial intelligence, nano-technology, realistic spacecraft, heroics, danger, sacrifice and adventure. Please don't send stories that show technology or space travel as evil or bad, or stories about Star Wars type galactic empires, UFO abductions or that contain paranormal elements.
The submission window is from January 1 to April 1 and will be judged by Baen Books senior editor Hank Davis and Jim Baen's Universe editors Eric Flint and Mike Resnick.
The GRAND PRIZE winner will be published in a future issue of Jim Baen's Universe, will receive a specially designed award, free entry into the 2009 International Space Development Conference and a year's membership in the National Space Society.
For full submission requirements and guidelines please visit the website at: williamledbetter.com/contest