While we're at it, there's another great public resource for learning new things at NCSA, the National Center for Supercomputing Applications. 

They  have a number of great online courses, like the one on MPI programming that I'm currently taking in my spare time.

All you need to do is register. And when you log out and log back in, it picks up where you left off.

Here's the URL:  http://webct.ncsa.uiuc.edu:8900/webct/public/show_courses.pl

It's been maybe fifteen years since I looked at MPI, and since then very few really good books on the subject have appeared. Really, the only one that you can actually learn how to program with MPI is Peter Pacheco's Parallel Programming with MPI

...and it's not that new. Yet MPI is the preferred programming API for most MIMD cluster's systems for C and Fortran. And, especially now with the open source version of MPI, OpenMPI ( open-mpi.org ) and Sun's ClusterTools 7 which is based on OpenMPI, we really need some up-to-date tutorials.