I'm a chaotic writer, that's a fact.
I don't plan anything, more then some major events, who the characters are, their roles and such. I have a habit of switching the back story and red line while I plan a story, so I try not to think of it too much, else I'll change everything by the time I've written half of it. That happened to an intended fantasy story, much like the Temeraire series. It turned into a steam punk action instead.
Right now, I have... Let's see... 10 or so projects I'm working on. I write maybe 2-3 pages worth of story, then I switch to another and work on that until I get bored, again, usually after 2-3 pages of writing.
Some stories that I find interesting (which is 5% of everything I come up with) I tend to remodel in my head, developing the plot and the characters, but I almost never write it down. I lose interest when I've planned my way through half of the story. Dunno why really.
Peh, I'm a horrible author