As for searching "Library 2.0," when I finally figured out how to control the search (entire blog vs. tags only) for blogs with "a lot of authority" (a celebration is planned each year on 11/18@7:15am), I got 1,052 results for "search the entire post", and only 259 hits for "tags only"; the blog directory didn't get that specific -- "Web 2.0" is a close as you get, but I was surprised that it gets that close since the directory is limited to pretty broad headings. (I guess I'm too old-fashioned, but I wish they had a big index of suggested tags.)
TIP: The easiest way I could find to change between searching complete blogs to just tags is to:
1. Search your term using the SEARCH box on the Technorati home page, and then
2. Use the CHANGE link to set your parameters:
CLICK to enlarge
I was a little surprised by some of the popular searches because they include names of a few folks I've never heard of. But I had no real expectations so there were no big surprises with the "most popular" blogs, except that I would have expected more celebrity gossip than political news, but maybe everybody's still keyed up from the elections...