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Yeah, Flash Player itself has the sandbox on domain access on several function calls. Unless this is different from the crossdomain.xml file I've used in a few cases since Flash 7.
I'm not sure if it's Flash or just Flex, but ExternalInterface and the JavaScript/Flash bridge is pretty powerful. Yahoo used it for quite a while to let AS3 apps communicate with an AS2 Yahoo Maps SWC. It sucked in some ways as the api calls weren't native from within your AS3 code, but it showed you could do a lot. Oh -- and if you're really tempted to play with AS3, there's a 90-day beta trial for Flex Builder 3 available. I can assure there's no licensing server with it... it's basically a very customized build of eclipse.
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