More or less a similar approach to Tir's: http://brubeck.io/

Have a look at Nagare - http://www.nagare.org/

Yes, Nagare (http://www.nagare.org) is a continuation-aware Web framework with the same components model than Seaside.

Python Stackless is used to take continuations and also to serialize all the states, which can be stored, by configuration, in memory or to an external Memcached server. With the later setting, all the continuations can freely migrate across the machines of a cluster.

If, then wait a bit, at the moment he is focusing and having a lot of fun writing books. We can expect (or hope) to have him back to the code in a couple of months :)

Would you mind saying a little about what kind of thing you are looking for? I am curious.

he has expressed a liking for web.py[1] in the past. He repackaged as lpthw.web for "learn python the hard way" book (chapter 50 or thereabouts).

[1]: http://www.webpy.org/

Look at brubeck (mentioned here). It doesn't support the different state management styles since Python's coroutines are broken, but it does most of it.