Just a note for those not following commits closely: Nevow trunk (what will become 0.5) now requires zope-interface, and twisted 2.0. For anyone trying to use Nevow without twisted installed at all, it's supposed to still work without twisted installed at all, but only if you convert your app to zope-interface style declarations, rather than twisted1.3 __implements__ style. Also, I don't know that anyone's tested it like that, so it probably doesn't work right now. Also, if you get an error like this: exceptions.TypeError: _interface_coptimizations.SpecificationBase.__new__(MetaTypedInterface) is not safe, use object.__new__() that means your zope-interface package is 3.0, which is buggy, and you should install 3.0.1. James