Most of probably never heard of it.
How about Amazon.com?
Yup, heard of that one. Well, CreateSpace is Amazon.com's self-publishing company, granting the way for many writers, musicians, and film-makers to publish their works without having to go through a more traditional way.
It's free to upload your books, music, or films, and from what I understand, you'll be able to have your works on Amazon.com's official retail site. There is a paid service too, which expands the reach of your work.