Hello, I'm a summer researching at St. Olaf College and we're building a beowolf cluster, we'd like to start learning about MPI and we're looking for recommendations for resources for learning about MPI.

The most popular resources seem to be:

Using MPI - 2nd Edition - ISBN: 0262571323

and 

Parallel Programming With MPI - ISBN: 1558603395

any ideas, pros/cons would be useful.

-William Voorhees