http://www.searchengineguide.com/stoney-degeyter/an-seo-clients-bill-of-rights.php
An infinitely more useful article on the topic than the usual trollfest that generally haunts this forum.
Note how the author clearly defines reasonable, well thought out points and at no point sticks to narrow minded, ill-conceived, naive perceptions of how he thinks "SEO should be", nor is there any mention whatever plucked-out-of-thin-air "evidence" used to back up flimsy arguments. Indeed it's nigh on unbelievable that almost 700 words have been written about SEO without the author feeling the need to point out his experience (whilst at the same time knocking the experience of his readers). In fact, it's almost as if the article was written for informational purposes and not just some forum trolls being arses for the sake of it...