These sites often have useful technical, business, and game design articles. There's lots to learn!

• [GameDev] - Lots of game development stuff -- follow the link at the top on "Articles & Resources". E.g. they have a good page of [links to networking articles].
• [Gamasutra] Many of the other articles referenced on this page are on this game developer's site. You may need to register with the site to get access. It's worth it. (We can provide expendable email addresses in the spookydistance.com domain if you want to be cagey about using your regular email address for this.)
• [flipcode] A daily game development news & resource site.
• [particlesystems.com] See discussion on Particle Systems
• [Collection of links] by Daniel Schlyder.
• [LostLogic.com] A site devoted to multiplayer games. Contains lots of links.
• [The ZBuffer] -- Managed DirectX Resources.