New (to me) LaTeX package

Since moving to LaTeX, I have had many moments of "ohhh, that's how they made X look so nice."  The most recent is "pstricks."  This package lets you develop professional looking figures relatively easily. 

I am still working on getting the output to work in PDF rather than PS - but otherwise I am quite happy with it.  I think it looks much nicer than the standard STATA figure.

Here is an example image of a figure.  It only takes about 7 lines of code.