Making maps for games, What do you use? Options

[IonMage]

I've been taking my own shots at GMing here and there, and I've made it a point to have maps of the important areas available. The problem is making these maps. I know that game stores sell pre-made maps sometimes, but the problem with that is that there is always something that I want different, and more importantly I don't want to stick to a template.

I could draw the maps myself, and use me and my players imagination to fill in the blanks, but problem is that my drawing skills are poor enough that sometimes the information conveyed is wrong, ie my lines are too squiggly or out of proportion. I could use MSPaint or something to keep things more organized, but thats a bit cumbersome. Then it hit me; in this arena where people make character generators, cheat sheets, et al, surely someone in the tabletop gaming fandom must have made a piece of mapping software built for tabletop games! Does anyone know if such a thing exists?