http://www.lostechies.com/blogs/joe_ocampo/archive/2008/06/07/my-issues-with-the-term-quot-scrum-master-quot.aspx

Joe here makes a good argument that the term Scrum "Master" implies that the are the master of scrum. My CST (certified scrum trainer) made a good point during our class: The word "Certified" means that they obtained the training from a scrum alliance certified source of training. With so many sources of 'scrum' training they wanted people to get the appropriate information and this is through the 'Certified' course.

I want to add that anyone and everyone in the scrum community acknowledges that the CSM is at the very most an introduction to the terminology and framework of scrum. It is NOT a class on how to make scrum work nor even is it a very good foundation on which to fully understand self directed work teams.

My favorite comment on the end of Joe's blog is something to this affect:

If you're interviewing a scrum master, make sure you have them talk about what impediments they encountered and how they got the team rallied around fixing the problem or at the very worst how they fixed the problem themselves.

The sign of a good scrum master would be an individual who understand that they have no authority and it all falls on the team, but that sometimes they must go the extra mile to ensure visibility and conflict resolution.

As an example:

I remember a while back i said if you have no product owner... do it yourself... This was an impediment and the solution isn't to have the scrum master be the PO, but the VISIBILITY is what will 'force' the solution to happen. :) (i'm still waiting to find out who brings the most pain down on me, so i can identify the real product owner) :) :)