I think that it makes a big difference whether people are employing tags themselves or just using blog software that supports categories. That's part of why I encourage people to use a bookmarklet to make such tagging easier. Why doesn't Technorati offer a bookmarklet like that? The blogosphere is full of people who would rather eat their own fingers than add the HTML for each tag link with a rel=tag at the end of each post. Requiring them to do so is a real limit to the specificity of tags being applied by non technical bloggers. That's part of why people like WYSIWYG blog editors.
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