Jobless as I might be, I do have some clients for data analysis. I try not to visit them in their office coz then things get really slow and time-consuming. When I can’t escape this, the worst thing is tuning data and software with client. So, I have a USB with portable versions of my toolbox. Yesterday, I installed R and today I tested it. It worked fine!
If you want to try it, download the software platform from here. Install it (when prompt to extract/unzip) into a file in your USB, ie /OS, and then download the R portable from here. From the portable OS menu (down-right on your screen) select install software and browse to the R portable file. After a couple of minutes you’re done!

Special thanks to Andrew Redd for providing us with the portable version.
R-bloggers.com offers daily e-mail updates about R news and tutorials on topics such as: visualization (ggplot2, Boxplots, maps, animation), programming (RStudio, Sweave, LaTeX, SQL, Eclipse, git, hadoop, Web Scraping) statistics (regression, PCA, time series, trading) and more...

Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).