Since I got my Cintiq, I've been trying to take a little time to dabble in digital inking. I figured I'd start by working in Flash, because I think that's what a lot of other cartoonists do. By watching a few online tutorials and practicing the craft, I think I've managed to achieve a non-horrible level of ability. Check these out:
The challenge is figuring out how to avoid getting those ugly, Flashy-looking lines, that do all kinds of things a computer would do, but real ink would never do. If you click on these and look closely, you can definitely find the tell-tale signs. I think if I tried hard enough, I could get rid of most of those, but the process would take ten times as long. So no wonder so many people allow a certain amount of Flashy-ness in their inking.
After I spend some more time with Flash, I plan to move on and try my hand at inking in Illustrator, and maybe a few other programs.