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This is a fantastic method. I wrote an iPhone app around this concept: http://thinklegend.com/commit One of my current commitments is to write 1000 words each day.
I can highly recommend 750words.com if daily writing is what you are after , lots of those little psychological hooks to keep writing. I just love all those semi-useless graphs and stats you can generate if you wish. Completely Free too (it shows around 5% of people as donating something).
You have to log in to use it.
Worse, it the login has to be Facebook, Yahoo, or OpenID.
No fucking way am I going to sign up for any of that shit, or let them track me as I visit sites I'm interested in.
No thanks!