Praise for TikZ/PGF
I'm a recent convert to (and big fan of) TikZ/PGF.
PGF is a “backend-independent” graphics layer for TeX; it can work with all of the backends (dvi, pdf, postscript, etc). It plays a role in TeX similar to the role of the “postscript page model” in PDF.
TikZ is a human-friendly syntax for PGF; it's sort of like the best parts of Metapost and PSTricks, with much better integration into the surrounding text (the inline \tikz command is really handy – sparklines are easy now!).
Even if you don't do graphics much, it's worth learning if only for the great \foreach command it comes with. Finally, a usable “for loop” for TeX. It only took 40 years