Those who are fantasy map geeks (like me -- I love to scrutinize maps and follow the action along them) can get a look at the map for The Amber Wizard here.
I drew the image freehand, using a pen I got for free from Sovereign Bank when they took over my old bank. It actually worked better than the other pens I picked up at an arts supply store. Go figure. About the only worthwhile thing I got from that lousy institution (other than a severance check).
After it was drawn, I had a friend of mine who owns a graphic design firm (thanks, Lori!) scan it in as an Adobe Illustrator file, which was the preferred file format I got in the specs from HarperCollins' art department. I then added all the text where needed, scaled it to the proper size, and shipped it off.
I have a map of the city Almaris that will be part of book two partially completed. This one I'm doing completely in Illustrator since I don't need mountains or other features that are much easier to draw by hand.