Some have found it useful. Manifestoes are an important part of any undertaking. In the tragic extreme, consider that the Unabomber believes his manifesto to be so important that he murders in order to ensure its publication. Why you do what you do, exactly what it is that you believe and intend to accomplish. People and organizations write them and make them available, sometimes in other newsgroups, random WWW pages or FTP archives.
All readers are welcome to submit a manifesto for themselves, or for an organization.
For most newsreaders, you can just post to alt.usenet.manifestoes normally, and your news software will forward your article to the proper place for approval. You will receive a reply to indicate that your manifesto was received. You'll be notified of its approval within 48 hours. Discussion of previous manifestoes is welcome. The newsgroup is not limited to serious manifestoes.