In October, MIT Press published the first really comprehensive book on parallel programming using the OpenMP API.

Using OpenMP,
Portable Shared Memory Parallel Programming, by Barbara Chapman, Gabriele Jost and Ruud van der Pas, with a foreword by David J. Kuck, covers shared-memory parallelization on a number of platforms.

I've had a pre-publication peek at it (because one of the authors, Ruud van der Pas, is a Sun engineer I work very closely with), and I can say that it packs a lot of very useful information in one place.

Most useful is a discussion of how cache lines can interfere with OpenMP parallelization and cause performance and scaling degradation if you are not aware of what's going on.

This will be a very valuable book on my shelf when it's available.