Slides: Data munging SQL and R : Revolutions: Coming to R from SQL, Python, SAS, Matlab, or Lisp

maybe a repost hahah but found these useful 

• SQL: Data munging with SQL and R (Josh Reich): PDF Slides
• Python: Learning R Via Python (or the other way around) (Drew Conway): PDF Slides

Thanks to the NY UseR Group for putting together such a great session, and thanks to the speakers for sharing their slides.

New York R User Group: Files

source : http://blog.revolutionanalytics.com/2010/01/the-r-rosetta-stone.html