Often, I read about someone's inspiring success story. Since I generally lose track of them, I thought I should keep a list:
Alex Pukinskis successes with [http://groups.yahoo.com/group/extremeprogramming/message/117540 relating XP to manufacturing Theory of Constraints]
Bob Jarvis' experience with [http://groups.yahoo.com/group/extremeprogramming/message/114961 CMMi assessment of an XP team] at a bank.