Word clouds are used by writers and web designers to be able to look past the trees and see the forest.  What they do is allow a person to look at a group of words and see what is used most often and get what you are really saying not just what you intended to say.  The larger the word, the more frequently it is being repeated.  They can also be grouped into topic related sub clouds. There are a couple of new word cloud sites that are particularly interesting.

This one uses news feed for a variety of topics to discern what is being said and it moves and grows from the feeds.  Infomous

This one is used to create a single static cloud that allows you to put in an article and find out what you said.  It can also be used to create some compelling artwork.  Wordle