A kind of cool time-waster at http://www.typealyzer.com/ lets you analyze the personality of a blog writer by submitting the url. Part of the results is presented as an image showing which parts of the brain are dominant for the writer. Here's mine;
The same site has two more similar features;
Gender Analyzer uses software to guess the gender of a blog writer (I apparently have an 81% likelihood of being male)
and OFaust which takes any submitted text and tells you which classic writers it most resembles (I have a low similarity to Goethe and Poe)
But don't take any of this too seriously. The Gender Analyzer has results just slightly above random guessing.