Lately I have been running R in parallel on a Beowulf cluster using the Rmpi package. Instrumental in my ability to do this were two excellent tutorials:
The Division of Biostatistics at UCSF provides some of the background required to get things running on the Linux side of things. (Note: sometimes the url for this site comes up with an extra "biostat" in the address -- just delete that and the page should load.
The Acadia Centre for Mathematical Modelling and Computation has a variety of sample scripts to point you in the right direction. Once you read through the code, it becomes very easy to set up a template you can re-use in the future.
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