On: Do any of the Y Combinator firms use Extreme Programming?

Some Ycombies may be using ideas promoted by XP, e.g. wide ranging automated testing, without chanting the XP mantra. I'd have thought good unit test coverage and web interface testing, e.g. twill, benefit fast site development, especially with today's dynamic languages like Python. http://twill.idyll.org/

Thank You. We plan to use both automated unit and web interface tests.