+1  A: 

You can use RaVis in Flash. Watch a demo here

Amarghosh
Very cool....I have to develop a web-app, then the graph is dynamic. Can I create a graph dynamically?
Gianfranco
By dynamically you mean programmatically, right? Yeah, you can use xml to describe the graph and create it.
Amarghosh
Yeah, of course... Tank you very much
Gianfranco