One of the papers presented at the WWW 2007 involves the efforts of researchers at the University of Toronto to provide some interesting ways to search blogs – BlogScope: Spatio-temporal Analysis of the Blogosphere
The application described is online in “preview” form – BlogScope. It’s presently tracking 9.90 million blogs with 76.78 million posts from Blogspot.
In addition to searching these Blogspot posts, it provides some interesting ways of looking at information in its index that we really aren’t seeing from any other blog search engine:
Popularity Curve – provides the ability to visualize the popularity of query terms as a function of time