Your links are not always the best indicator of a site’s relevance. This is especially true when talking about SEO on blogs. Your tags on a particular subject can act as a table of contents when a visitor arrives at your blog. But interestingly enough as Matt Crum points out, the pages that contain a list of articles on a particular topic do not score well in Google’s ranking. In Crum’s example all the articles on SEO referenced by that tag on the webpro blog do not rank highly even though there is a well spring of meaty posts there. So does this mean you should not use tags with your posts. I definitely believe you should use those tags because your visitors will use them intuitively and spend more time on your site. Google is not the only source of relevance or utility on the web.