In an era where information is both a means and a medium of exchange, constant changes and updates in search engines' algorithms for measurement of information relevance is the rule rather than the exemption. I have observed that while serving to make the web an efficient and effective information superhighway, search engine algorithm updates have spelled doom for several websites.
This precisely is the reason why I don't stick to any particular rule when it comes to SEO. No strategy will ever be enough to cope up with the constant algorithmic updates of the search engines. Quality, however, will always be the main objective of any update, and this is where I come in, to provide not only relevant but also high quality organic content.