AnyChart is a flexible Flash based solution that allows you to create interactive and great looking flash charts.
Axiis is a Data Visualization Framework for Flex. It has been designed to be a concise, expressive, and modular framework that let developers and designers create compelling data visualization solutions.
Also, take a look at the nice window-in-window design on the saturnboy blog.
Source : http://www.insideria.com/2009/12/28-rich-data-visualization-too.html
Find via : http://www.poetpainter.com/