Thanks to @ericasmith, I learned about http://wordle.net, which creates word clouds in super-easy format. It takes all the words of any text you put into it and spits out something like what you see below. The bigger the font for a word, the more often it was mentioned in a text.
Once you create one, you can change the font, color, layout, and much more. Cool tool!
From FDR’s “Day of Infamy” speech: