For something considered “so 2004” not long ago, the internet is exploding with web logs. They really have developed away from angst writing by geeks and toward niche-specific communities. Technorati is the authoritative source on blogs and blog links. They have been tracking sites since March of 2003 which just happens to be when i started using blogging software to update my site. At that time there were 250,000 blogs that they tracked. Here’s a little graph with a few points that i added for relevance.
Cena, Karna, and i were blogging before Technorati had tracked 10 million blogs. There are other web logs that i read that would fit on here but the three of us are the oldest that i follow that have not lost archives. Hooray for early adopters!