Very cool, vinsci just mentioned on #plone LaszloSystems.
It’s some sort of web application framework written in Java which supports an XML language for creating GUIs which then get compiled to Flash. So check out the demos at that site, it looks very cool.
Might be nice to have such a thing for plone with a different skin ;-)
(OTOH it might be hard to do in Zope as I think it does use some sort of connection between the flash part and the server for sending data forth and back. The usual solution to this would normally be polling which might not be that efficient..)