American Chemical Society - this is the homepage of ACS. You can find tons of information and search engines that are specific to chemistry here.

Atomic Structure - go here for some good basic information about atomic structure and some colorful graphics too.

Biographies of Famous Scientists - you will find biographical information on the biggies in science right here. It's cross referenced to find people in specific fields of science and new sites are added all the time.

Chemfinder.com - this site will give volumes of information for researching compounds.

Chemistry Functions - this web page is a FIND! You can do all types of calculations including a unit conversion thingy and another that will balance equations.

Elementymology - nifty periodic table information and an etymology of the names of the elements.

MSDS Information - this is the website put together by Cornell University where you can find cross referenced information on the MSDS information of your dreams!

Sheffield Chemputer - this site is designed by the University of Sheffield and includes tons of important material. Go here to learn about Isotope Patterns, Element Percentages, Oxidation States, etc. There is a connection to the world famous Sheffield Web Elements site too.

Fun with Spectra! - not my choice of names but definitely my choice of spectra info pages. Check out the questions at the top of the page for information that you will find invaluable.

Imagine the Universe - NASA's site from Goddard that has information about advanced topics in chemistry, physics and astronomy. Some script errors may occur while these pages load. Click "No" to continue loading the page and "No" to debug the page.

Laboratory for Astronomy and Solar Physics - NASA site for Solar Physics.

Spectra of Gas Discharges - shows the most commonly found elemental gases in solar spectra are illustrated as pure bright line spectra.

Solar Spectra - emission line spectrum of the sun.

Solar Type Spectra - look at more Fraunhoefer and Lyman alpha lines then you should safely consider in one lifetime.

David Whizzy Periodic Table - not to be confused with the non-whizzy type of periodic table. This one comes with the pithy instructions to "Click things and see what happens!" It takes some time for the applet to load but it's worth the wait.

Periodic Table - this one is from the folks at Los Alamos National Laboratory. Click on an element and find out all kinds of cool stuff besides just the obvious chemically things.