Look for the upcoming post (Thursday, Dec 10) in InsideRIA.com about 28 Rich Data Visualization Tools. I’ve included the first three to whet your appetite.
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.