I've posted my slides from Thursday's Testing XML presentation at SD Best Practices 2006.
FourThought has released the Amara XML Toolkit 1.1.9, an open source "collection of Python tools for XML processing-- not just tools that happen to be written in Python, but tools built from the ground up to use Python idioms and take advantage of the many advantages of Python." Amara includes:
Python 2.3 or later is required. This release adds support for EasyInstall, and makes various other small improvements and bug fixes.