the99percent.com has an article on the value of writing a manifesto and how it can be used as a “touchstone for decision making.”
Manifestos are a powerful catalyst. By publicly stating your views and intentions, you create a pact for taking action. (Movements from the American Revolution to Dogme 95 film to the Firefox web browser were all launched by manifestos.) If you want to change the world, even in just a small way, creating a personal or business manifesto is a great place to start.
…developing a set of principles that you believe in and constantly strive to stand by is an invaluable tool.
The article includes examples from Frank Lloyd Wright, Leo Tolstoy and marketing guru Seth Godin.
There is, in fact, a long tradition of artists and arts movements starting with a penned manifesto. There’s a good summary of those here.