I am a complete newb when it comes to editing images with anything more advanced than MS Paint. So when I tried to use Dundjini and Campaign Cartographer to make some maps to use in Roll20 I was totally overwhelmed.
I found something else that seems to be working very well for a complete novice like me (I've made 2 passable maps with it so far):
<a href="http://www.dungeonographer.com/" rel="nofollow">http://www.dungeonographer.com/</a>
I'm not affiliated with them in any way, just thought some people here might want to give it a try if they want something on the simple end of map editing software.