One reason I’m happy for Todd is that he's a client-side marketer blogging about his profession on the side. The book Citizen Marketers refers to this as "productive leisure." This means his blog is a labor of love and this achievement must be all the more gratifying for him as a result.
As Kami Huyse points out, there is a bigger picture to consider as it relates to blog measurement that needs to be sorted out. But the list is still a great starting point for people looking for blogs on marketing, advertising and public relations.
Disclosure: Strategic Public Relations and The Bad Pitch Blog were both lucky enough to land on the list.