The Spectroscopy Net
The Spectroscopy Net was created by Dr. Richard Payling in 1999. Its purpose is to promote knowledge about spectroscopic methods for chemical analysis and about spectroscopy in general. It has been designed for both people looking for general information and specialists in the field. The Spectroscopy Net therefore contains an educational part with general information on spectroscopy and spectro-chemical methods for analysis, and detailed information of commonly used techniques as well as results of recent development.
http://www.thespectroscopynet.com

WebSpectra - Problems in NMR and IR Spectroscopy
This site was established to provide chemistry students with a library of spectroscopy problems. Interpretation of spectra is a technique that requires practice - this site provides 1H NMR and 13C NMR, DEPT, COSY and IR spectra of various compounds for students to interpret. Also includes tests on Solving Spectral Problems, Overview of NMR Spectroscopy, Notes on NMR Solvents, Types of NMR Spectra, Introduction to IR Spectra, Table of IR Absorptions.
http://www.chem.ucla.edu/~webspectra/

What is Mass Spectrometry?
This website is from the American Society for Mass Spectrometry. It covers subjects such as uses of mass spectrometry, history of mass spectrometry, what a mass spectrometer is an example of a mass spectrum, how the analyzer and detector work and elemental mass spectroscopy.
http://www.asms.org/whatisms/