A Dwarf Fortress fan from the http://www.penny-arcade.com forums.
I have a bad habit of generating worlds over and over looking for "perfect" sites: not only with the usual desirable features such as several different types of rock layers, the possibility of magma, flux, water, trees and sand; but with an interesting and aesthetically appealing terrain layout, certain types of biomes such as tropical moist broadleaf forests (rainforests!), a south facing cliffside, sufficient distance from other dwarven towns, and extreme temperatures.
And then I ruin my vision by not planning my fort layout very well. Whooooops!