BlazeWeb (formerly pysmvt) is a WSGI web framework library designed to be relatively "light weight", but with a powerful plug-in and override architecture that facilitates modularized development.
Please visit: http://groups.google.com/group/blazelibs
The code stays pretty stable, but some of the API will probably change in the future.
The BlazeWeb tip
is installable via easy_install with easy_install BlazeWeb==dev