Interesting piece in the New York Times. Quote:

A survey conducted by Blogads.com, which administers online advertising on blog sites, and completed voluntarily by 30,000 blog visitors last spring, found that 5.1 percent of the people reading the blogs were lawyers or judges, putting that group fourth behind computer professionals, students and retirees. The survey also found that of the 6,232 people who said they also kept their own blogs, 6.1 percent said they were in the legal profession, putting lawyers fourth again, behind the 17.5 percent who said they were in the field of education, 15.1 percent in computer software and 6.4 percent in media, said Henry Copeland, founder of Blogads. He conceded that the survey was hardly scientific, but argued that at least it undermined the popular image of the blogosphere as dominated by antsy teenagers and programmers in their pajamas, tapping away at keyboards all night.