Tim Challies has posted a follow-up on his review of The Shack [ed.: link updated to an archived link because the original was broken]. As expected, it prompted a vigorous discussion in the comments. (See also this post [ed.: link updated to an archived link because the original was broken] for another discussion, which Challies cites.)
The one thing I have never figured out about the way people talk about this book is the insistence that The Shack is allegorical. It patently is not, but that does not seem to prevent lots of insistence from supporters that it is.