Math Links

Quaternion Julia Fractals - A nice overview by Paul Bourke.
Ray Tracing Deterministic 3D Fractals - Great paper from UIC.
Ray Tracing Fractals on the GPU - A very well written paper by Keenan Crane.
Baseball Prospectus Basics - Baseball prospectus is a company that makes its living using statistics to predict the outcome of baseball games. The best part is that they're quite accurate. This article talks about one of the new stats they use.

AI Links

UCI Machine Learning Repository - If you're interested in machine learning this is a fantastic place for some free data to use.
Introduction to Radial Basis Function Networks - Does a good job explaining how these work.
Game AI - Great site that lists interesting AIs seen in different games.

Game Programming Links

Game Developer Magazine - It's not a very thick magazine but each month I find myself reading just about every article in it.
Gamasutra - Phenomenal website with industry news and great articles.
GameDev.net - In my opinion this site isn't as great as Gamasutra, but it still has a lot of interesting content.

Fun Links

Fark.com - A collection of funny user-submitted news stories.
Defunct Games - This is a really cool site that does reviews of older games
The Cleveland Fan - Great site for anyone interested in any of the sports teams from Cleveland.
Indygamer Blog - A frequently updated list of FREE independent games.