Honestly, if you want to draw maps, Cartographer's Guild.com is your best bet.
Second this and you may also want to check out Art Gallery, Cartography & Miniatures Painting - EN World D&D / RPG News
Most of the programs (Dunjinni, Fractal Mapper, Campaign Cartographer, AutoRealm (which is FREE)) and others comes down to the user, it is finding the best one for you and the one matches the work you are going to put into map making. Demo them!!!
Some others:
http://www.wizards.com/default.asp?x=dnd/dnd/20061121t
http://www.jailoco.net/jai.hordelings/dungeontilesmapper.htm
http://www.dungeoncrafter3.com/
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