Below is a tag cloud of the recent speech Australia Rising, by Australian Prime Minister John Howard.
The cloud was created by a neat little program called "many eyes" which is a data manipulation/representation program. Well worth checking it. What a great way to compare the main ideas of 2 separate pieces of writing. It's searchable as well.
I discovered this wonderful tool on George Siemens' Connectivism blog
"Functional visualizations are more than innovative statistical analyses and computational algorithms. They must make sense to the user and require a visual language system that uses colour, shape, line, hierarchy and composition to communicate clearly and appropriately, much like the alphabetic and character-based languages used worldwide between humans." Matt Woolman