Sometimes I write a blog where I use R to solve unimportant (but nagging) problems. Topics include board games, the price of petrol in Sydney, or setting up an API for your R code.
Over the years I have developed over a dozen R packages, often implementing more challenging analytical methods with a nice R-friendly interface.
I used to teach an R course (and several advanced workshops) at Western Sydney University. I developed a lot of the material (and the website) on http://www.hiercourse.com.