Hmmm..how coincidental. After some prayer, I decided to go through the book again in a 40 day study format. Ironically, it was roughly a year ago that I did the same thing. What I gleaned so far is this:
It's definitely not a populist book, even though it hit the mainstream bestseller lists. Maybe some people would have picked up the book thinking it was another self-help book but one quick glance at the phrase: " It's not about you" should be sufiicient to convince them otherwise.
It has a strong emphasis on service and corporate( read: church) responsibility.
This is how I see it. It's a 40 day program that is a bit more structured than a 365 day devotion for the day program in terms of a theme. But it is no different in that sense from the various discipleship courses that churches run.
I feel that the PDL is meant more for the solitary Christian, the one who feels that they don't need to go to church or belong to any form of fellowship. While it might catch the attention of non-Christians; I don't feel that they are the target audience.