I've said before that I am a terrible mapper. By that, I mean both that I'm not very adept at drawing maps nor at designing them, though I have gotten better at the latter. As to the former, Dungeonographer seems like it might be able to solve that problem. Below is a rendition of the dungeon from "The Ruined Monastery," which appeared in issue #1 of Fight On! three years ago. I was able to whip it up in fairly short order and without much difficulty, neither of which I'd have expected, given past attempts to use dungeon mapping software.
All in all, I'm pretty pleased. I'll probably try my hand at something more complex in the next few days.