As Anna stated, I did have a longer write-up that appears to have been eaten alive by the comment moderators. Here is the link to my site where I have written about some of the myth of the "Poor Man's Copyright": http://kennethgray.com/64/copyright-artists-myths-fact/ I hope this is helpful and can add to the discussion of this important topic.
Thank you for taking the time to rewrite what the "comment moderators" so carelessly deleted. I just read and enjoyed your article on copyright for artist. I believe it should shred some much needed light on this part of the law.