For information on the book about retrospective practice in Agile teams, see the pragmatic programmers bookshelf:

http://www.pragmaticprogrammer.com/titles/dlret/index.html

Also

"Secrets of Agile Teamwork: Beyond Technical Skills" makes it's third public appearance in Portland Oregon, June 6-8. For more information on the course and registration forms for attending, drop me an email or attach a comment request.