Neal Caren's (UNC) data scraping/processing tutorial. Potentially a useful teaching/learning resource?
Yet another Git tutorial that proved useful to me at some point.
I swear I remember this diagram from the GNU Arch days.
I think this would be pretty easy to do with gpplot2, but Portfolio looks like its worth checking out too.
Simple intro to graphic programming in Python. From pfctdayelise.
Nice sort of R thesaurus for other statistical software.