1. Yes, the results are different. When I did the keyword search, I found information in the blogs on "School Library Learning 2.0", but when I did the tag search, I had fewer results. There were only two blogs. When a blogger is very specific in using tags, the search results are so much more defined. Tagging makes it easier to find what you looking for, but the blogger has to be the one to define their posts with their tags.
2. I had never heard of Boing Boing (most popular blog in the world, as ranked by Technorati.com) yet it held the #1 spot on the list of "Top 100 Blogs" and was #5 on the list of "Top 100 Blogs by authority. It was interesting to see how the same blogs seemed to be on the two lists...TechCrunch and Engadget were two others that were in the top 5 of each of the lists. I guess if bloggers use the appropriate authority tags where people can find their information it makes for a much better reader base, makes sense.
3. Technorati seems too difficult for me to completely grasp. Maybe I am not spending enough time exploring the different areas. I guess this would be a great resource for researching a topic in order to find others writing or researching in the same field. I wanted to claim my personal blog on Technorati, but then changed my mind. My blog is not a secret, but I don't know if I would want the world to know everything my friends and family know, even though anyone can access my blog. I guess that is a double standard, but it is how I feel.