This short report is a little dull, but the topic is important, and did I mention it was short?
Cusumano, M. A. 2007. Extreme programming compared with Microsoft-style iterative development. Commun. ACM 50, 10 (Oct. 2007), 15-18. DOI=http://doi.acm.org/10.1145/1290958.1290979
If you are a Fresno State person you can go directly to the article here.
University of Hawaii people can go here to access CACM, authenticate, then go to the October 2007 issue.