I think the links here are fairly useful, in part due to great suggestions from people on Twitter – get them while they’re fresh. Let me know what other cool things I’m missing.
I also update our own site’s portal page and graphics books page for good measure. One cool new link on the portal page is for Shader School, for learning shader programming, which a few people have recommended. The shader compile error messages are unfortunately obscured on some platforms, but if all else fails you can check the answers.