Being new to dungeoneering myself, it has become a new obsession of mine to find awesome dungeon maps and gennies and try to emulate them. Fortunately for me there are like a billion or so! What's that you say? How am I ever to tear myself away from running searches and actually get to gaming? Great question, glad you asked. Answer: I have no idea. How am I to stop following links on blogs when they lead to things like this?
RisusMonkey Dungeon Map Generator
Not only is it cool and customizable, but it looks super hand drawn. Hooray!
And if that ain't enough and you still scream for more
Multi-planar dungeon map created using http://davesmapper.com/
Please excuse while I vomit from sheer geek-citement.