I recently found the blog of Megan Sumrell. She remembered me of the skills a ScrumMaster should have. Jens Oestergaard and I created together with our people in the Certified ScrumMaster training the following list:

• Good listener
• Good negotiator
• Leadership skills
• Willingness to take action
• People skills
• He is like Robin Hood, Nelson Mandela, Martin Luther King
• She knows Scrum
• She understands business mechanics: ROI, lean management
• …

This list is not complete. What would you add?