For mobile - and future browser - compatibility, your charts should
either be a dynamic image or rendered via the HTML5 canvas. Flash-based
charts will not work on Apple mobile devices.
You could to release a "native app" - instead of a web app - for mobile
devices (which I'm not promoting); In which case you could use all the
cool Flex/ActionScript charting libraries - and release use the various
mobile app compilers for Flex.
Personally I think that "app's" on the mobile computer will pretty much
follow the same arc to browsers - that app's did on desktop computers 10
years ago. But that's another subject...
Al
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online documentation: http://openbd.org/manual/
http://groups.google.com/group/openbd?hl=en