I didn't know what a word cloud was until recently. Apparently it tracks the most frequently used words of a blog, a speech, a poster. And it is revealing. Matthew 12:34 says "The mouth speaks about what overflows from the heart."
You learn a lot reading a word cloud.
So with that, Marshall Kirkpatrick at ReadWriteWeb posted several word clouds from inaugural speeches, including Obama, Lincoln, Bush, Clinton and Reagan.