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The-Wiki: http://c2.com/cgi/wiki?ExtremeProgrammingRoadmap
Whos-Writing: http://c2.com/cgi/wiki?WhosWritingAboutXp
Gentle-Introduction: http://www.extremeprogramming.org/
XP-Summary: http://ootips.org/xp.html
XP-123: http://www.xp123.com/
Ron-Jeffries: http://www.xprogramming.com/index.htm
XP-Sceptic: http://www.softwarereality.com/ExtremeProgramming.jsp