GPU Gems Edited by Randima Fernando can be found as an HTML version on nvidia’s developer site. (This is old news to many, I’m sure. But… Yay nvidia!)
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I’m particularly drawn to the section on image processing on the GPU, specifically chapter 21, which talks about creating a real-time glow. Great for the algorithm, but I’m more of a GLSL guy than Cg—so here’s some GLSL specific links: