http://technorati.com/ is a site that is very user friendly. This site makes searcing for blogs very easy. Searchin by tags or in posts did reveal different results for “School Library Learning 2.0”.
When I explored the "Popular Blog" I did not see anything suprising. I did, however, enjoy the fact that the popular sites were broken down into "Top 100 Blogs by Fans", "Top 100 Blogs by Authority", and "Top Searches." Those different lists make it easier to find what you are looking for.
I have really started to understand the need for tagging. Tagging in links and websites simply makes things easier. It simplifies searching your own and other's resources.