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P4A is an open source, platform-independent RAD framework that lets you build Rich Internet Applications (RIA) in a few minutes.
http://p4a.sourceforge.net/

Looks pretty cool to me, although I haven't messed with it yet. Look! Even the fine city of Torino is using it:
http://www.comune.torino.it/

I'll mess with it some more then see if I can make a custom example. The irritating thing is it doesn't come with documentation. It says, in the readme, "We are so busy coding, you need to figure it out then write the documentation," or something to that effect, only in broken Italian/English.

The idea behind frameworks is a good one though. Just because Torino re-invented Mambo, it doesn't mean you would have to do anything like that.