My advice is to always design a site with at least two forms of navigation: one that’s 100 percent search engine friendly and one that may be less search engine friendly. If I design a site with DHTML menus, I always have a corresponding navigation scheme of text links at the bottom of a page. If that’s too many links, I cross-link pages via contextual links (also known as breadcrumbs) and embedded links in the main content.
I always have a site map link on every page. It’s never hidden from viewers. Don’t try to hide a site map link in a transparent GIF or hidden text. It can get your site in trouble.
Never use this tag to hide any unrelated content or links you wouldn’t otherwise show site visitors.
Due to this tag’s widespread abuse, most search engines either ignore or decrease the relevancy of the text inside it. Additionally, most end users will never see the content. Search engines tend to ignore all “hidden” tags or at least not use them to determine relevancy.
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