Don't let me have all the fun...you can analyze your Twitter feed or someone else's right here:
AnalyzeWords helps reveal your personality by looking at how you use words. It is based on good scientific research connecting word use to who people are.
I found this on the Texas Tribune blog where they analyzed the Texas politician type accounts.
You can read all about the science behind the site here. It was started by James Pennebaker who is a professor and chair of the Department of Psychology at the University of Texas at Austin.