Via Planetalinux.mx, I read this post by César Espino refering to Wordle.
Quoting from Wordle's main page:

Wordle is a toy for generating “word clouds” from text that you provide. The clouds give greater prominence to words that appear more frequently in the source text. You can tweak your clouds with different fonts, layouts, and color schemes. The images you create with Wordle are yours to use however you like. You can print them out, or save them to the Wordle gallery to share with your friends.

I could not resist it. I even went to a computer with a Java runtime installed.

The application is very nice and usable, although its startup time is frankly irritating (specially as there is no feedback on why it's not loading). Anyway, the results are quite beautiful!