Have you seen this site: www.wordle.net?
Wordle, an online toy created by a senior software engineer at IBM Research (Jonathan Feinberg), creates "word clouds" - an image of the words contained in a body of writing.
Wordle.net highlights the frequency of every word in the text being used, and provides a graphic for the user.
Apart from the fun aspect of Wordle, I believe this site can be used as a resource for anyone blogging, advertising, or writing with emotive language.
Take a look at the site and let me know what you think ......