I just ran across this paper on the web. Very interesting after our
discussion at the 1st World Forest R Congress.
State-of-the-art in Parallel Computing with R
Markus Schmidberger, Martin Morgan, Dirk Eddelbuettel, Hao Yu, Luke
Tierney, Ulrich Mansmann
Technical Report Number 47, 2009
Department of Statistics
University of Munich
http://www.stat.uni-muenchen.de
Here's the link to the PDF:
http://epub.ub.uni-muenchen.de/8991/1/parallelR_techRep.pdf