Mike: how it's used in Cheetah, and this book chapter http://diveintopython.org/regression_divein.html .
Adam: ?, how it's useful in Extreme Programming? with example?
Steve: I could speak real briefly about some Java classes that I wrote that help you do unit testing with console I/O. There are two approaches--you can spin off another thread to drive the I/O, or you can have a smart mock object where you pre-load the conversation. I kind of prefer the latter. Both concepts should be portable to Python.
Questions & Comments: Is pyUnit and unittest.py the same thing? Note that it's a standard module in Python 2.1.