Teamwork is an Individual Skill, Chris Avery. Berrett-Koehler Publishers, 2001.
Chris spoke at the Agile a couple years ago, and I really enjoyed his talk. He explores many themes: teamwork, feedback, commitment, collaboration, trust. His perspective is that individual skills make these possible. Almost every section has personal and team challenges that give you areas to work on. Highly recommended. (Reviewed June, ’07)