AmstradHero Richard Crockett, author of the recommended Making a Better Quest (pdf)
Chris Hecker's Website excellent essays from SpyParty's dev
Eskil Steenberg's Blog more philosophy than development
Filip Coulianos' Blog has some great essays on level design
Fullbright Steve Gaynor, some intriguing thoughts on game design
Gausswerks: Design Reboot Jack Monahan, superbly illustrated game redesign
Jailbreak: Source Blog contains one of few text XSI tutorials
Nodraw.net Source engine level design
No Time To Play when development IS the game
Nullpointer Tom Betts, indie developer
Radiator Blog one of the few to update regularly!
Robert Briscoe's Devblog the man who quashed Source doubters
The Psychology of Video Games Jamie Madigan knows why
The Witness Jonathan Blow's new game
Wesley Tack's Blog inspirational mapping from Off Limits dev
Zeitgeist promising start for new blog, contains Maya-to-Source export tutorial
I would like to have made this Source-specific, but there's a positive dearth of Source blogs.
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23 Nov 10 - added a few, removed a few
13 Dec 10 - added The Witness dev blog











