Wordle is a web tool for creating "word clouds" from text that you provide, from a specific web address, or from the tags associated with a users delicious.com account. The clouds created can be customized with different fonts, layouts and colors. The clouds created can be saved or exported for use in other applications. One interesting use of this is to paste in the text of a piece of writing to generate a word cloud of the most frequently used words in the writing. This can be useful to help students visually see the words they are using in their writing and the frequency with which those words are being used.