Source: Study: Half Of The Top 100 Blogs Now Use WordPress | TechCrunch
Stashed in: Tumblr!, The Web
From Technorati's list of top 100 blogs.
Tumblr -- the easiest way to blog -- only has 1 of the top 100.
WordPress is the winner-take-all in blogging, but Tumblr created an entirely new market where WordPress is not.