Wordle is a web site that allows you to create "word art" from text that you type into a box. You can also enter a URL of a site. Wordle will then collect words from the URL or the words you typed and create beautiful cloud patterns out of it. The clouds give greater prominence to words that appear more frequently in the source text, just like tag clouds used in blog.
After you have typed your text and clicked GO, a cloud will be created. You can now apply your tweaks. Try changing the fonts or the color. Change the orientation of the words from horizontal, to mostly horizontal to vertical or mostly vertical. You can also arrange them haphazardly following no particular direction. Didn't like the layout? Then re-layout it to make a different pattern. Is a particular word spoiling the whole pattern? No problem. Right-click on it to remove.
Word art I created with text from this blog
After you are satisfied with the work, you need to save it. That's where Wordle needs to do some work. Believe it or not, there is no direct way to save your artwork on your PC, although it allows to save the word art on their online gallery. The only way to save it as an image is to take a screenshot. How lame! To save it as PDF you need to install a virtual printer like doPDF (it's free and mighty useful).