This is a Blogpulse graph for Library 2.0 over the past 30 days. The best feature of blogpulse is that it allows you to hover over the top or bottom of graph lines, click on them, and read date-specific citings.
This is a Technorati graph for Library 2.0 over the past 30 days. The graph can be changed from 7 days up to 360 days. The search can be limited to specific languages, or by blogs with "a little" of authority or "a lot" of authority.
The Blogpulse and Technorati graphs for the same time period look similar but are not the same, but then, they have different search parameters.
Compare with the Google Trends graph for Library 2.0 I posted a couple weeks ago:
tags: libraries, librarians, google, blogpulse, technorati, library2.0, web2.0