47% of all blog posts are tagged
David Sifry provides more Technorati stats, this time with a little more info on the tagging front.
Turns out tagging is really kicking off. The number of posts with tags or categories has grown past 100 million mark since Technorati began tracking tags in January of 2005:
Nearly half (47%) of all blog posts have an author-generated category or set of tags associated with the post. For this analysis, Technorati excluded generic or default categories, like "General" or "Diary", which some services put into each post if the author doesn't specify a particular tag or category. We only counted posts that used a non-default tag or category."
and that each post tagged have:
"one or more tag or category associated with the post"