I somehow missed this, so you probably have seen it already, but that Google search application in Flash is putting more bones* around Macromedia's RIA concept.
(*) pardon my English, it should read flesh instead of bones. But let's say that since this comes from Macromedia, their job is to provide the bones for the developers to provide the flesh. That will be my excuse for posting without re-reading while being in a hurry ;-)