Clickz reports a study that found only 9% of fortune 100 companies have effectictively optimized sites. For the study, good SEO included "unique title tags, unique meta descriptions and meta tags, relevant body text, and anchor text containing primary keywords or phrases."
Of course that last one, anchor text, is probably the most important (although links from different IPs may be necessary for full benefits) and Fortune 100 companies could probably buy all the anchor text they need...
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