At the AAG meeting 2007 in San Francisco Roger Bivand gave a workshop on Analyzing Spatial Data with R. His scripts and slides are posted here with permission. Please note that the scripts are based on the earlier R version 2.4.1. I have so far not encountered any problems in running them in R 2.5.0.
I searched for this for a long time, so here is from http://proj.maptools.org/faq.html
Where can I find the list of projections and their arguments?
There is no simple single location to find all the required information. The PostScript/PDF documents listed on the main PROJ.4 page under documentation are the authoritative source but projections and options are spread over several documents in a form more related to their order of implementation than anything else.