Stephen Hawking's Homepage - Has some information about the life and work of the greatest physicist of our times.

John Gribbin's Homepage - A great author, some interesting topics about quantum mechanics. I would recommend his book In Search of Schrödinger's Cat.

Jackson's Antietam - Another website that I ran for years. Will probably be archived due to difficulty in finding a web host.

Seankelly.tk² - Sean Kelly's homepage, some cool articles, although it is rather new.

How Stuff Works - A comprehensive, searchable index of information and diagrams explaining how stuff works. Updated daily.

Soda Constructor - One of the most interesting sites around. I found this one really addictive. Of course, it took a while to learn the basics, but the creative possibilities are staggering. IM or e-mail me if you need help.