Tagging isn’t just a tool for usability (even though it’s typically mostly thought of in those terms), it’s also a powerful weapon for search engine optimization. That’s because tagging allows you to rejig your internal hierarchical linking structure, flowing the link juice more strategically throughout your site. And because those links are textual and keyword-rich, a tag cloud is far superior in terms of SEO to the traditional graphical navigation bar.
When tagging is applied to a website, such as a blog, it can significantly increase the site’s traffic by achieving visibility for a much larger array of search terms.

The above quote is from my recent Search Engine land article entitled, “Effective Tagging For Both Usability & SEO.” I go into a lot of details how strategic tagging can help you. Here is a tip about tag clouds that I’d like to share with you:

Tag Clouds: When you tag your blog or website, the items are then put into an organized, keyword catalog. By taking those tags, you can organize them into a “tag cloud,” which shows keyword topic popularity by the size and sometimes color of the font. Tag clouds enable you to force a new navigation styles for your site or blog based on keyword popularity, and also help your website look up-to-date with enhanced, Web 2.0 functionality. (For an example of a tag cloud, you can see one at the end of my blog.)

For other, more specific tagging techniques, I hope you visit my article. 🙂