In Their Words is a unique resource from The Wall Street Journal about the inauguration. It lets you choose any two presidents, then pick certain words, and ultimately shows you a comparison between the two about how many times each mentioned that word.
I’m adding it to The Best Sites For Learning About President Obama’s Second Inauguration.
While I’m at it, I’m also adding these resources to the same list:
Inauguration Day in History is a photo gallery from The Wall St Journal.
Inauguration Day 2013 is another WSJ slideshow.