This is a little late coming, but my latest piece for UX Matters was published last week: User research for personas and other audience models.
“…this article is about the ingredients we can draw on when creating audience models and some alternative ways of communicating the results of an audience analysis.”
I’m planning on writing a follow-up article that looks in more detail at the different types of audience segmentation we can use to help inform the design of online services. Keep an eye out for it in a few weeks.