InterfaceLeader

There are tons of blogs and websites out there that are designed to help you make a better game. To go from mediocre, to great. To become a ground-breaking visionary as opposed to that guy who made Deathsquad Racer 7.

Writethegame.com

Clearly I am going to add this one in, since it's run by some of the people I work with. None the less, plenty of genuinely interesting articles, phillosophising, advice and resources.

 http://aigamedev.com/

This is probably the best resource I've found for articles on the ins-and-outs of Game AI. The writer knows what they are talking about, and shows you how to solve common problems.

Devmaster.net

Hundreds of thousands of articles about game development, along with a database of game engines and industry news.

Gamerswithjobs.com

It's reviews and news and all the usual stuff, but it's a good site, and it's useful to keep abreast of these things.

Artfulgamer.com

"In search of the poetic and lyrical in video games". Video games can be so much more than just derivative shoot-em-ups.