Where can I promote this?

Hey guys, I want to promote this site, http://www.thezeitgeistmovement.com its the movement created by the maker of the film Zeitgeist Addendum and the venus project . I wont make a dime doing it, It doesnt matter. I dont mind one bit, as long as I reaches as many people as possible. What ways can I market that site , Preferably in ways that I wont have to invest any? The niche is Sociology. Time to do some philanthropic marketing! Share some ideas guys.