This not really a finance post, but as a financial economist, one of my main tools is the statistical software package called STATA. Stata is one of three programs that most academics in my area use. The other two are R and SAS. Anyhow, Stata users might find useful a recent post on the marginal revolution blog about some helpful Stata resources.
I particularly like this one which allows you to visually pick the kind of graph you want to make, and then shows you the code to do it.