Binaries of R-2.2.0 for OS X and the new version of R.app (cocoa GUI) 1.13 are now available on CRAN at http://CRAN.R-project.org/bin/macosx (please use the mirror nearest to you) Binary packages of both CRAN and BioConductor repository are also available for download and install. This binary version of R runs on OS X 10.3.+ and above. OS X 10.2.+ users can still use R-2.0.1 which is the last binary build for this release of OS X. Enjoy! R-Core Team