newsmap

A newsmap, based on the Google news fee: newsmap.

More:

http://www.cs.umd.edu/hcil/treemap-history/

And here are the main info visualisation projects Ben Shneiderman and his team have worked on:
http://www.cs.umd.edu/hcil/research/visualization.shtml

Here's a link to the US stock market: http://www.smartmoney.com/map-of-the-market/