I made a word cloud out of Breach over at http://wordle.net/. How cool is this? Note to self: cut way the heck back on similes next time around... good grief. Also, I am such a NON-morning person (seriously, you don't want to be around me until I've had some coffee) that I'm very surprised "morning" came out so much bigger than "night." :)
How it works is that the words that appear more frequently are bigger. If you go over to the Wordle site you can upload your own text -- and yes, it'll take an entire manuscript in there -- and create your own word cloud. You can change the fonts, colors, etc. and then do a screen capture to save it. Or if you have Windows Vista, there's a built-in "snipping tool" that works pretty well for stuff like this.
[Edited to add: Wordle also has a gallery of clouds people have created and chosen to save publicly. This one for Bruce Springsteen's Born to Run album is pretty cool!]
(Click on it to see it larger.)