First posted map.
I have been drawing maps for years on paper, but this is the first time I used the computer. Used a package called paint.net (it was free). I wanted a simple map for a Sword and Sorcery role-playing game. Loosely based on the map in Baests and Barbarians and whole lot of borrowed and made up stuff.
It's a simple map but it is very clear and informative (two of the most important things a map should be) and still looks good. I like it.
You get good results out of Paint.net - nice job. I like the layout, the coastlines, the overall effect. Crisp pixellation instead of antialiased is kind of my thing, so I approve of the style.
If it paint.net seems to limit you, there's other free graphics packages too :-).