'Seaside' is a Smalltalk framework for what might be called "Modal Web Development" or "Synchronous Web Programming", or even "Continuation Based Web Apps".
http://www.beta4.com/seaside2/
Very sexy it looks too. And it seems to be generating a lot of interest - Ruby and Java variants have already sprung up:
http://rubyforge.org/projects/borges/ http://lakeshore.sourceforge.net/
actually, there are also implementations in Scheme, Common Lisp (UnCommonWeb) and Cocoon-FLOW has similar concepts.
And somewhere (I think on the portland pattern repository) I recall reading that Viaweb (aka "the first web app") was written in CPS. Also notice that the Wee project in ruby is more advanced that Borges.
I googled for the python spin-off but didn't find one. Closest I found was Imposter (http://csoki.ki.iif.hu/~vitezg/impostor/) which looks like an earlier, partially failed attempt to do what Seaside now seems to be delivering.
I think "independent" more than earlier, it seem many people are reinventing this from time to time.
Anyway, I just wanted to point out that IIRC something on this lines appeared recently in the nevow svn tree, maybe you can take a look.
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