An enterprising web author has put up an very cool dynamic web site that contains tag clouds of US presidential speeches from 1776 to the State of the Union this spring. For those unfamiliar with tag clouds, they're basically lists of words that vary in size and color based on frequency or popularity. It gives some idea what the main themes and pushes of each speaker were. Scroll the slider back and forth to see back in time. Interesting to note the increase in use of the word "Terrorists" (as a proportion of words used) from the 2002 State of the Union to subsequent years.