This may be what you mean when you're talking Flash, but . . .

If you can accept Flash 9, Flex is pretty interesting. The base SDK environment is available free (in the beer sense; or there's an IDE for ~$500). In about a week+ I was able to cargo cult together something using the (for pay) charting components with some marginally complex behavior. If you've got familiarity with a GUI toolkit and JavaScript knowledge you should be able to pick up MXML and ActionScript pretty easily.