Python Paste is a web application framework framework. It uses WSGI to create a framework-neutral set of components. It also assists with application setup and deployment.
Paste includes a reimplementation of Webware for Python.
To check out Paste:
$ svn co http://svn.w4py.org/Paste/trunk Paste
Note that it includes a script build-pkg which fetches a bunch of packages that make Paste more useful. A big tarball of all the requirements stuffed together will probably be forthcoming.