Wordle is a pretty cool program. If you've never used it before, you can copy and paste text into a box, and the site will arrange the text into word clouds based on frequency.
Here is an example, with the first sixteen verses of John:
I think that's pretty cool.
But a really cool thing you can do is enter a blog address/feed, and it will analyze all the text. So here is the word-cloud for this blog:
Try it out. I did one with "The Allegory of the Cave" that turned out really well too, but I didn't save it. I have it up in my classroom, though.