Spectroscopy: NMR, IR, Mass Spec plus some organic chem study guides.
Japanese Site: This is one of the best for IR's. Has thin-film spectra, u.a. Also has NMR, and others.
Sigma-Aldrich Co: Have FT-IR Raman and FT-NMR of the compounds they sell.
NMR Information Server: Seems to be a repository of info about NMR, MRI, ESR, NQR. Have not evaluated yet.
IR of oxygen-containing compounds: Daniel J. Berger at bergerd@bluffton.edu, Bluffton College 1178
IR of other compounds: ibid
IR:  http://www.mpcfaculty.net/ron_rinehart/spectral.htm has a listing for a basic IR tutorial at CSU Stanislaus

Emission/absorption spectra for the elements: very nice site.

About light:
There are thin film materials called interference filters that can reflect
red light and transmit cyan (blue+green) light.
http://micro.magnet.fsu.edu/primer/lightandcolor/filter.html

For more on color see:
http://www.sci-ed-ga.org/GASEFPresentations.htm
http://www.sci-ed-ga.org/modules/materialscience/color/sites.html
http://www.sci-ed-ga.org/modules/materialscience/color/materials.html

"The Chemistry and Physics of Color: The Fifteen Causes of Color" by Kurt Nassau (Wiley, 1983). a color Bible.
2nd edition to this book in 2001 (also Wiley)