Here are a few stats on blogs. Though the source I'm using is about 3 years old, the information is interesting:
How many bloggers update daily? --- One in Five
How many bloggers write more than one blog? - - - More than Half
What is the typical age of bloggers? - - - 60% are between 18 and 44
Are more bloggers male or female? --- 70% are male
What percentage are from the US? - - - 49%
Internationally, what is the number of blogs listed? - - - 133,000,000
What percentage of people who use the Internet read blogs? - - - 77%