Wordle

At wordle.net you can create really interesting 'word clouds.'

All you have to do is paste in a bunch of text (a chapter from a book, a bunch of random words, etc.) or type in the address of a blog. Then wordle will mix up all of the words you typed (or words from the blog) and turn them into a 'word cloud' (you'll see what I mean if you try Worlde out). Then you can change the color, font and arrangement of the words.