How to: create a heat map of the market

I am interested in creating a heat map of the stock market using internal data, in much the same way as the following site: http://www.smartmoney.com/map-of-the-market/

We have all the data necessary to do so, as well as a C#/ASP.NET front end and a C#/SQL Server 2005 back end.

Can anyone recommend any resources for creating this type of开发者_如何学运维 web application? P.S. Free is better!

This is a technique called Treemapping. This is tons of information on how to generate these kinds of graphs online.

The charting tools provided by http://www.anychart.com/ are really good for this.

Heres some examples of their heat maps. I've used these charts before with ASP.NET and C#. Very easy to use.