I use Scrivener to write my first drafts. This program not only allows me to color-code in whose head I am with each scene, it allows me to set a schedule for the project, and then it calculates the amount of words I need to write each day in order to accomplish my goal and get the work done on schedule. It will even flash a "Goal Met"indicator and ring a bell for you.

My writing goal, according to the almighty Scrivener, is nearly 1,000 words a day. Which roughly translates to one scene a day. I like to write this way, since I can stay clearly in one person's head throughout. Today, it was Elijah's turn. I planned how I was going to start the scene last night, as I was drifting off to sleep, so I tore up the screen for the first 80 words or so. Then, I stared at the blinking cursor for several minutes, uncertain where to head. The next sentence came to me as if through a vat of molasses, then the one after that. I kept pulling down the "Targets" tab on my Scrivener program to see how many words I had yet to go. When I got to 200 words for the day, I got stuck, so I stared at the pulsating cursor for a few more minutes. The rest of the scene unfolded in my head, finally, and I began to type quickly. When the bell rang that I had met my goal, I wasn't ready to stop, so I kept going until the scene was finished.
I surprised myself that I completed the scene, and that once I got past the first 500 words, I got so sucked into the scene that the ringing bell was an annoyance rather than a blissful chime signaling that my day's torture was done. And the little extra bonus from not stopping until the scene was done? Tomorrow, when I settle in to write the next scene, I'll have a few fewer words to write to get to my daily goal.
So, how about you? Do you write in all-out sprints like Colleen McCullough, or do you plod along like I do? I'm curious to see how many different styles I'll be able to record in the comments.