So this sounds like a RAM concept of short-term memory. The problem with this analogy is that when the computer shuts down everything in the RAM memory vanishes. Wait. That sounds familiar.
I made the illustration at http://www.tagxedo.com/. www.wordle.net is nice but it doesn’t let you save word clouds as jpg images so it’s not much use for blogs. Both of them let you paste text (this one is just the article as a word cloud) or write it yourself.
Here is another cool version from www.worditout.com