Ted talks of a "Player Cache" existing within Flash Player 9.3 that allows the Flex components to be reused across domains.
It would be an extra-benefit if my components can be reused across my multiple websites.
"Only Adobe can create signed Runtime Shared Libraries, and only signed RSLs can be stored in the Flash Player cache. If you create an RSL that contains a custom library, it will be unsigned. You cannot sign it." My only addition to that would be, "…yet."
Knowing Adobe, if you ask loudly enough, the company finds a way.