NVIDIA has just put online the first chapters of GPU Gems #3. This book contains over 40 chapters (around 1000 pages) of the latest GPU programming techniques, and includes hundreds of full-color diagrams and pictures. For this first online edition, all chapters (7 chapters) of the first part dedicated to Geometry are available for reading.
Link: GPU Gems #3: Part 1
I think I won’t buy the GPU Gems #4. I’ll wait for the online edition…