Every so often, an open source tool turns out to be really, really good.

If for any reason you're looking for a vector drawing program, have a look at Inkscape. It's new-ish and has a few stray weirdnesses, but only a few. And it comes with excellent tutorials, it looks good, and they've thought hard about making it ridiculously capable but still very usable.

And a lot of the results are quite pretty, which is a plus. Artists seem to actually use it.