"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 wanted to play with the tool, so I pasted in the almost 5,000 words of a short story I am revising ("Vestigial") just to see what would emerge. You can edit the look/feel of your word cloud and the java applet will redraw it to your heart's content. I 'printed' mine to a pdf, then clipped it into corel to save it as a jpg. Probably there are easier, more direct ways to do this.
I thought Woordle was most cool.