Another cheat sheet. This time on R environments, frames and the call stack. At the time of writing, it was the last one in the Google documents directory.
Like with my other cheat sheets, please let me know if there are any errors in this one. I am constantly updating the cheat sheets as I find subtle (and sometimes, not-so-subtle) errors.
My cheat sheet on reference classes is almost finished, so it might be the next off the production line.
Update: I reorganised the cheat sheets so that they are now classified basic, intermediate and advanced.