Awesome! It's coming out in February 2009!
This probably means bupkis to most of you, but N&P's Inferno is one of the most interesting sci-fi books with an explicitly Christian theme ever written. Not quite in the stratosphere of A Canticle for Leibowitz or A Case For Conscience, it is nevertheless interesting, and absolutely unique.
It is an attempt at a theodicy of Hell.
The answer the authors came up with is not exactly orthodox, but it is thoughtful.
It should be interesting to see where N&P go with the sequel, so I guess that goes into the queue in early 2009.