I have used the AT outreach for lessons before. It's a cracker of a site for learning about spectroscopy.
I use the Project CLEA stellar spec program to demonstrate to my students the procedure for taking and analysing spectra.
http://www3.gettysburg.edu/~marschal/clea/CLEAhome.html
Many useful simulations.
Al, the top link seems very heavy going.
Might take some time to digest.
