[CreationTheory.org] - A site by Mike Wong on the creationism versus science debate. Contains some great essays on the subject. Very well done.
[TalkOrigins.org] - The most complete analysis of the creationism versus science debate on the web.
[Mathworld] - If you love mathematics, this is the site to go to. Great for reference.
[Checkerboard Homepage] - Martin Fierz's website. He is the author of the Cake checkers engine and the CheckerBoard program. CheckerBoard is to checkers as Winboard is to Chess. Cake is one of the strongest checkers playing programs in existence and it is absolutely free! Couldn't ask for a better deal.
[KingsRow Homepage] - This is Ed Gilbert's site. He is the author of a checkers program called KingsRow. It, like Cake, is a checkers engine which runs on CheckerBoard. KingsRow is also one of the the best checkers engines in the world, and it's free too.