Many people are familiar with SmartMoney.com‘s Map of the Market. (No link available as this is a javascript pop-up). It displays a map of the stock market, broken into sectors. The size of each tile is a function of the market cap of the particular stock while the color is based upon the trendline of the stock price. Red means the stock is going down while green means the stock is headed up. Shading is based upon percentage change. A really cool application.
Marcos Weskamp (along with Dan Albritton) has a newsmap application in a similar vein. It maps news stories, again by sectors, with various news sources available (it defaults to stories from US new services). The size of the tile is based upon the number of articles, the color is based upon the the sector and the shade based upon how old the article is.
Pretty cool.