I was looking for a simple way to lay out and to keep track of my blog and website organization. I love it, mainly because it is simple (not many extras or fancy things e.g. you can’t bold or italicize text), a very small program, and a very short learning curve. It doesn’t compare to, say, using the Outline feature in Word, but for a quick organizational tree it’s great.
I’ve since expanded and am using it for a Journal for my designs as well – keeps everything in one place.