Some reference on Sweave, R, and literate programming

1. http://www.bepress.com/cgi/viewcontent.cgi?article=1148&context=jhubiostat
2. http://www.kieranhealy.org/files/misc/workflow-apps.pdf
3. http://epub.wu-wien.ac.at/dyn/virlib/wp/eng/mediate/epub-wu-01_c75.pdf?ID=epub-wu-01_c75
4. To be continued...