While looking up some XP info tonight I came across these:

From http://www.armaties.com/extreme.htm:

Many of the XP practices were created and tested as part of the Chrysler C3 project, which is a very successful payroll system implemented in Smalltalk.

From wikipedia – Chrysler Comprehensive Compensation System:

The plan was to roll out the system to different payroll ‘populations’ in stages, but C3 never managed to make another release despite two more years’ development.

Not sure if you can call the above successful.

Reminds me of my experiences with a XP project I worked on at IONA. One word: misinformation.