swirl

Check out swirl. This looks like a great way to start to learn R and to learn new things about R. I like it.  Give it a try and let me know what you think.

pipeR

Check out pipeR. This is a new way to make R code more readable.  It is similar to the pipe in unix. I like it.  Give it a try and let me know what you think.

R Presentations

After R Markdown, one should give R Presentations a try.  It is based on R Markdown.  It is very easy to use and looks very nice.  The Rpubs website is easy to use and make your R Presentations available online.

R Markdown

I have been using R Markdown in RStudio recently.  If you have not given it a try yet I would encourage you to do so.  It is very nice for documents that include the current output of executed R commands.