Does Python have a unit testing framework compatible with the standard xUnit style of test framework? If so, what is it, where is it, and is it any good?
I recommend Nose. 
After the reasonable simple installation, you just have to run "nosetests" in your project folder and Nose will find all your tests and run them. I also like the collection of plugins (coverage, GAE, etc.) and the abilty to call Nose directly from within my Python scripts.
Unit tests in Python