Similar to previous versions of the standard, the MPI-3.1 standard is now available in hardcover.
Even though I have a copy of the MPI-3.1 PDF for quick/easy reference on my laptop, I find something intangibly inherently useful (and comforting?) in having a paper copy of the standard to thumb through.
The books have been (literally) spanning the color spectrum:
The books are available at cost - yes, that's right: this is not a profit-generating endeavor - by the good people at HLRS (specifically, through the efforts of Dr. Rolf Rabenseifner and his team).
Click here to be taken to the HLRS web site, where you can click-through to purchase the book in Euros or US dollars.
The MPI-3.1 blue book is 38oz of parallel computing goodness.