David D. Perlmutter in the Chronicle of Higher Education:
Media attention to blogging has exploded, in part because of a number of what I call blogthroughs, events that allowed bloggers to demonstrate their powers of instant response, cumulative knowledge, and relentless drumbeating. Those incidents included bloggers’ role in challenging the memo about President Bush’s National Guard service revealed on CBS, which may have led to Dan Rather’s resignation as anchor of the network’s evening news; video logs of the tsunami in Southeast Asia; and the high-profile use of blogs by Howard Dean’s campaign for the last Democratic presidential nomination. Now, according to various measurement and rating services such as Technorati and BlogPulse, tens of millions of Americans are blogging on all kinds of subjects, like diets, relatives, pets, sports, and sex. Bloggers include journalists, marines in Afghanistan, suburban teenagers, law-school professors, senators, and district attorneys.
Of greatest interest to modern students of politics are the blogs that focus on public affairs.