Is SEO a big part of how you do business online? If so, stop! The number one piece of advice I could give anyone is to design and develop your websites for your target audience - for your users - instead of for the search engines. In fact, doing so will actually IMPROVE your search engine rankings. Search engines are focusing more and more on tweaking their algorithms to best perform when presented with websites that are designed for real users. Additionally, they can easily spot keyword and link stuffing and other "seo techniques" more than ever before.