Industry Directories

AstroExpo
http://www.astroexpo.com/ 

AstroExhibit
http://www.astroex.com/  

Brian's Space Hotlist
http://www.ssl.umd.edu/space/

Clark's Space Links
http://www.hobbyspace.com/Links/index.html

Mike Gruntman's Astronautics and Spacecraft Design
http://ame-www.usc.edu/bio/mikeg/astromike/index.html  

Swiss Propulsion Laboratory Links
http://www.spl.ch/links/ 

Satellite Industry Links
http://www.satellite-links.co.uk/links/satman.html 

Encyclopedia Astronautica
http://www.astronautix.com/