R Tutorial

Great source of tutorials on R

http://rtutorialseries.blogspot.com/

Also:


http://digitheadslabnotebook.blogspot.com/search/label/R

http://r.andrewredd.us/?p=41

http://brocktibert.wordpress.com/category/r/

http://r-ecology.blogspot.com/search/label/R

http://www.statmethods.net/index.html