Parsing Inaugural Words
The New York Times has an interesting web feature up right now that presents a timeline of all of the presidential Inaugural addresses from 1789 on. While that is pretty useful in itself, this site is particularly interesting because it shows you a tag cloud of the frequently used words in each speech. It's a great way to quickly survey the changing language and themes.
The page is available here: Inaugural Words: 1789 to the Present.