American Institute of Aeronautics and Astronautics: http://www.aiaa.org
NASA Space Science News: http://spacescience.nasa.gov/ :
Hydrogen Energy Resources: http://www.tinaja.com/h2gas01.html
Space Settlement Ideas: http://members.aol.com/oscarcombs/settle.htm
Scientific American Magazine:   http://www.sciam.com

IEEE Aerospace and Electronic Systems and Geoscience and Remote Sensing Societies

Society of Allied Weight Engineers - serving the aerospace, shipbuilding, land vehicle and allied industries.

--http://www.asce.org/                Society of Civil Engineers.
Royal Aeronautical Society - the professional insitution and learned society for the aerospace industry.

Society of Flight Test Engineers , North Texas Chapter - Fraternity of engineers, whose principle professional interest is the flight testing of aircraft.