The GPU can be hacked for fun and profit. GPU's and the systems based around them (think: PS2/3, etc) are very interesting beasties...lots of potential!

• GPGPU site
• Class on GPU Programming at UPenn
• OpenNvidia...machine vision on the GPU
• GPUBench GPGPU performance benchmarking
• Peter Shroeder's GPU Hacking course
• GPGPU Tutorial by Alex
• GPGPU PingPong Tutorial

• Nvidia's Cg Toolkit
• Cg Linux examples Note: many Cg code snippets for Linux come with broken build instructions. This page shows you how to fix them.
• Cg Tutorial
• cgshaders.org: Check out the forums !

• bithacks
• Using the GPU as an AUDIO processor.
• Reverse Engineering the NV Riva128
• Direct Rendering Infrastructure for X11/Linux
• John Carmack's thoughts: NV30 vs R300, etc
• The RedBook:OpenGL Programming Guide
• Advanced OpenGL Programming
• The (Re)Archtecture of the X Window System
• GPU Notes
• nVidia Overclocking: Recently updated (April 17)
• Glitz:OpenGL image compositing library
• Xgl server: X server built on top of OpenGL/Glitz...sweet!!! Here's the source: Xgl source
• Luminocity:Window manager and compositing manager with GL output. Cool. And a half.
• NV_fence:OpenGL command synchronization
• GPU floating-point Paranoia
• AGP Implementation notes