Assuming that the concept of the free spirited muse one is beholden to is false, and based on the understanding that to be able to write well one only requires practice, peace of mind and persistence: I signed myself up for http://www.100words.net/.
The idea is simple: you agree to write 100 words every day, no more, no less - about anything. The only rule: that you have to upload those words daily for a month before the site will share your work with the world.
I’ve signed up to start at the beginning of November. Does anyone else fancy joining me?