PyKDE
PyKDE, written and actively maintained by Jim Bublitz, is a full interface to KDE's libraries. This allows you to write fully-fledged KDE applications with python.
PyKDE needs PyQt and SIP to run. These are both actively maintained by Phil Thompson.
Documentation is available at Riverbank Computing Limited.
If you have written an application for PyKDE, please list it here:
The PyQt Wiki contains a list of applications using PyQt and/or PyKDE.
Frescobaldi is a LilyPond music text editor written in Python using PyKDE4
pyRad is a wheel type command interface to allow quick access to programs.
Links to other resources
Jim Bublitz was interviewed about PyKDE for KDE Dot News in September 2006.