Chirag Mehta's "US Presidential Speeches Tag Cloud" site is really neat! By comparing tag clouds from presidential speeches 1776-2006, you get a vivid picture of how the agenda has changed over the years. The tag clouds show the popularity, frequency, and trends in the usages of words within speeches, official documents, declarations, and letters written by the Presidents of the US between 1776 - 2006 AD. Cycle through the administrations by using the slide rule at the top. Awesome!