Wordle is a sweet word and wiring visualizing tool.  www.Wordle.net has the ability to analyze the most frequent words used in a text (can be pasted in, weblinked, or typed in) and then creates a visual representation of those.  Here is a slideshow, I came across while reading Mike Fisher’s blog http://digigogy.blogspot.com/; in it uses for Wordle in the classroom are shared.