The new beta of Flex 3 takes another step or so to resolve webbiness issues. One is becoming more open. Still it's not HTML, but heading in the right direction.
More immediately pragmatic is "deep linking" so the problem of Flash/Flex being a blob of unlinkable bits is significantly less of a problem.
Neet-o. I still think it's better to view a Flex app as kind of like a "browser executable" that reads webs of resources as would any other web client. But doing this *and* being able to deep link to within that "browser executable" is something.
This is most useful when the application is is behaving in ways not easily implemented in Ajax.