I came across some fab sites since I wrote my post on word clouds a couple of months ago and, as I'm both a vocabulary fan and a compulsive sharer ;) here they are! Definetely worth a look!
Just copy or paste text and you'll get great clouds.
Make your clouds and then change them by changing the visualization criteria.
Very easy to make clouds with gorgeous forms.
Very easy to use, you just copy and paste to visualize in different fonts and colours.
You introduce a term and get definition, usage and related words.
This is a search engine that shows results in the form of a cloud. Also check out Quintura kids