The best part of the book is the article by Dean Calver on vertex compression. Most of the other material are good practial tricks on shaders plus tutorials. Dean's article not only gives a clever way to compress and decompress vertex position - by concating the model view matrix with his decompression matrix. His use of eigen vectors to find the principal axis is refreshing. He also showed us how to extend the method to handle geometry that are larger and cannot be handled within the precision of the basic method.