I came across this blog post (a post about a post about a site) that discusses a beta online tool, Typealyzer, that tries to determine your blog's personality. Mine came out to be "ISTJ - The Duty Fulfillers."
The responsible and hardworking type. They are especially attuned to the details of life and are careful about getting the facts right. Conservative by nature they are often reluctant to take any risks whatsoever.
The Duty Fulfillers are happy to be let alone and to be able to work int heir [sic] own pace. They know what they have to do and how to do it.
Doesn't sound too flattering, but I guess it could be worse. What personality is your blog?