The study has detailed information on blog creators:

The Pew Internet & American Life Project began asking about blog creation in the spring of 2002. In June of that year, 3% of internet users said they had created a blog or web diary that others could read. By the beginning of 2004, the figure had grown to 5% of internet users. Our survey in late November showed that the number grew to 7%, which represents more than 8 million people. Blog creators are more likely to be:

• Men: 57% are male
• Young: 48% are under age 30
• Broadband users: 70% have broadband at home
• Internet veterans: 82% have been online for six years or more
• Relatively well off financially: 42% live in households earning over $50,000
• Well educated: 39% have college or graduate degrees

And blog readers:

An even more dramatic story emerges in blog readership. We began asking about this in the spring of 2003 and found that about 11% of internet users at that time had read blogs. The figure jumped to 17% this past February and leapt to 27% in November. The growth in 2004 alone amounts to 58%. Blog readers are somewhat more of a mainstream group than bloggers themselves. Like bloggers, blog readers are more likely to be young, male, well educated, internet veterans. Still, since our survey February, there has been greater-than-average growth in blog readership among women, minorities, those between the ages of 30 and 49, and those with home dialup connections.

We have seen these trends reflected here as well, with both members and readers diversifying pleasingly over the last year, a trend I hope continues as we grow and penetrate further into the inner sanctum, or perhaps the bowels, of the Internet.