PCIT: an R package for weighted gene co-expression networks based on partial correlation and information theory approaches

Fortunately, R package developers finally got to the problem of parallel computations. An excerpt (below) from a recent Bioinformatics article is a good illustration.

PCIT: an R package for weighted gene co-expression networks based on partial correlation and information theory approaches - Summary: We make the PCIT algorithm, used for detecting meaningful gene–gene associations in co-expression networks, available as an R package. Automatic detection of a suitable parallel environment is used such that scripts are portable between parallel and non-parallel environments with no modification of the script.
Availability and implementation: Source code and binaries freely available (under GPL-3) for download via CRAN at http://cran.r-project.org/package=PCIT, implemented in R and supported on Linux and MS Windows.