I think I’m coming a bit late to this party, but I found a web app called Wordle.
You give it some text or a link to an RSS feed and it makes a tag cloud out of it. A tag cloud is a way of displaying a bunch of words where the words that appear more frequently are larger.
Wordle has a lot of options for how to color the words, the font and whether to arrange them vertically, horizontally or both.
A word cloud for the RSS feed of my website is attached to this post. I don’t think that’s a true representation of the text of my blog – it only seems to include the most recent posts, possibly because of limitations of FeedBurner.

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