It is now possible to call R from SAS using SAS/IML Studio v 3.2. The only benefits of using this is when there is a need to use R and SAS obviously. For example manipulating the data in SAS and then analysing the data with Random Forest, CART or other new Statistical methods that have been implemented in R but yet to be implemented in SAS!
It’s funny how some people still say that they use SAS for the manipulation and R for the plots when SAS 9.2 (Proc SGPLOT, SGPANEL, SCATTER and RENDER) offers good quality plots, and R has functions that can manipulate datasets eg sql.df.
Anyway watch this space for a good example of how the R integration with SAS works superbly!