AdAge has a little piece with some interesting facts about blogging and bloggers. One of the stats is from Pew Internet Research which found that 85% of bloggers said they don't do it for the money and 52% say they blog to express themselves creatively.
There are 15 million blogs out there and they're read by 57 million people.
I'm guessing that if you take away the readers of this blog that makes about 56,999,995 people!