The R Programming wikibook is an open source community project that "aims to create a cross-disciplinary practical guide to the R programming language." It was launched in June 2011 and is seeking content and contributors. The full call for the R Programming wikibook can be found on Tal Galili's blog. The R Programming wikibook itself is available at http://en.wikibooks.org/wiki/R_Programming.
I am writing to raise awareness for the R Programming wikibook and to formally offer content from the R Tutorial Series by John M. Quick for use under a Creative Commons Attribution-ShareAlike 3.0 Unported License. This means that articles from the R Tutorial Series may be included in and modified for the R Programming wikibook, so long as proper attribution is given and the resulting content is made available under an equivalent license. A complete list of contributing blogs can be found on the R Programming wikibook's Sources page. I hope that the R Programming wikibook will thrive and grow to support a large community of R users, including readers of the R Tutorial Series.