I stumbled upon Kary Oberbrunner via Evotional.com, Mark Batterson's blog. Kary wrote a new book called The Fine Line. I've got it on my "want to read list" on Facebook. Kary draws a distinction between 3 historic approaches to following Christ: the Separatist, the Conformist and the Transformist.
Here's a thoughtful video from the author that condenses the message of the book: