Very interesting: Ben Bangert has ported Routes to Python. Routes is the core of the mapping of URLs to functions and back that is used in Ruby on Rails. So a general mechanism with which a Python object can be determined from a URL and a URL can be determined from a Python object - flexibly configurable.
Could also be interesting as an element in Django, as an alternative to the current URL pattern system. The current system elegantly provides the function to be called from a URL - but unfortunately there is not the same way back from the object or the function back to the URL.
In addition, Routes could also be interesting within WSGI projects - it elegantly solves a small sub-area and in such an abstract way that it should harmonize well with things like Python Paste(Ian Bickings Meta-Framework for WSGI applications).