When I wrote papers in college, I usually waited until the night before, sometimes had half an idea of what I was going to write about, and would then start pounding away on my keyboard with some Mountain Dew to keep me company...I currently have outlines written up for three separate books.  *Gasp!* I know.  I'm shocked too.  I've never actually written a book with an outline before, so knowing where I'm going and what I'm doing beforehand is kind of blowing my mind.