Nice. I had looked at the older editions of this book but don't recall that it covered GPU ISA (i may be wrong here since i have not really put in the time to study GPUs) ?

Amazon search brought up the following two interesting books, perhaps somebody who has browsed/read them can chime in;

1) Advanced GPU Assembly Programming: A Technical Reference for NVIDIA and AMD Architectures by Gareth Thomas.

2) Numerical Computations with GPUs edited by Volodymyr Kindratenko.