AstronomyOnline.org – Nice website with great details on several areas of astrophysics. Great for getting a feel for the science.

Christian Buil – A very detailed site with LOTS of information from stars to spectrograph construction.
http://www.astrosurf.com/buil/

Cyanogen Productions, Inc. – Makers of MaximDL (see Software)
http://www.cyanogen.com

Easy to use real time spectroscopy software.
Rspec-astro.com

Rhea Corporation – SPECTRA SOFTWARE
http://www.rheacorp.com

VizieR Database – Where we go to find info on stars.
http://cdsweb.u-strasbg.fr/

Winer Mobile Observatory – Our destination observatory in Arizona. They rent piers for robotic telescope systems.
http://www.winer.org