Hello abraxas:
My contribution (it's not on line, but is a pretty cool flow chart that help you (anytime and anywhere) to interpret IR and NMR spectra. I hope that you have access to Journal of Chemical Education.
Title: Interpreting infrared and nuclear magnetic resonance spectra of simple
organic compounds for the beginner.
Author(s) : Ingham, A. M.; Henson, R. C.
Citation: Journal of Chemical Education (1984) 61: 704.
If you don't have ACCESS to JCE, please send me a private message and I'll send you a pdf copy of this article. My email is chiralic@gmail.com
Best regards,
Chiralic