Unrestricted - your apps will still be deployed as SWF's,
like with non-charting Flex apps.
You may want to check out the Flex 3 pricing structure, it's
not something I've studied myself, but I know charting is packaged
in a "professional" package, it may be more worth your while
waiting until FB 3 is available.
Still, the answer to your original question is that there are