I see this map as a tool.... To see and try to analyze where NS is growing, and try to analyze the resson... And see where it doesn't.
The newsletter is a tool to communicate. But try to think about what type of audience?
For me the newletter is a community tool.
So why not to put the content of this newslatter in the blog?
When the blog is another communication tool for another audience like jounalist, or IT decisioner who make vigilance on the net.
It seem that the blog is not used often.
Is the blog and the newslettes can be used for the same purpose? And the same audience?