Some interesting stats on the blogging phenonemon:

• 23,000 new blogs are created every day — that’s about one every three seconds (source: Technorati)
• 11% of Internet users report visiting blogs written by others. Between 2% and 7% of adult Internet users in the United States keep their own blogs. Of those, only about 10% update them daily, the majority doing so only once a week or less often. (source: Pew)
• 61% of the blog readers (of those surveyed) are over the age of 30, and 75% make more than $45,000 a year. (source: eMarketer)
• 66.0% of surveyed blogs had not been updated in two months, representing 2.72 million blogs that have been either permanently or temporarily abandoned. 1.09 million blogs were one-day wonders, with no postings on subsequent days. The average duration of the remaining 1.63 million abandoned blogs was 126 days (almost four months). A surprising 132,000 blogs were abandoned after being maintained a year or more; the oldest abandoned blog surveyed had been maintained for 923 days.(source: Perseus)
• 400,000 blog posts are created every day in the blogosphere, which averages out to about 4.6 posts per second, or over 16,000 posts per hour (source: Technorati)
• About 45% of all older weblogs have not had a post in 3 months. (source: Technorati)
• 92% of bloggers are under 30 (source: Perseus)
• There are only about 5,000 corporate bloggers. (source: Technorati)