Chemistry

Chemtutor
On-line tutoring and reference for General Chemistry. Great site.

Web Elements
A great source for information on specific elements.

Spectral Database
This is a large database that contains mass spectra, NMR spectra, etc.

NMR Resource
Another NMR resource on the Web.

Fisher Scientifi
Fisher's Home Page and excellent resource for MSDS.

Chemicool Periodic Table
An interactive periodic table from MIT.

Clean Fuel Generation LLC
Economical alternative energy products.