Inaugural Words: 1789 to the Present, is a page that allows the user to track every Inauguration Day speech ever made in America. Each speech is represented by a tag cloud, giving the user a quick sense of the issues of the day.
The user can then click on any word in the tag cloud and see how many times it was spoken during the speech as well as see a chart of other presidents who have used the same word. The context of each word is also shown relative to the person who spoke it.
For a simple site, it's quite robust. In addition to the above features, you can view a complete transcript of each speech as well as download a PDF of the New York Time's coverage of the address going back all the way to Franklin Pierce in 1853.