The patented Map of the Market feature from SmartMoney (this view shows Aug 8, 2011) shows more than 500 stocks at once, in rectangles sized in proportion to their market capitalization, and colored green or red according to latest trading activity, up or down.
The visualization is derived from work done by Prof. Ben Shneiderman and students at the University of Maryland Human-Computer Interaction Lab on treemap displays.
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