The following are a list of links and books that are particularly useful while following the GAPS protocol.
Gut and Psychology Syndrome by Dr. Natasha Campbell-McBride.
Gaps Guide by Baden Lashkov is both the name of her website and book. A how-to approach on GAPS, it is the first resource you should buy after getting a copy of Dr. NCM's book.
Internal Bliss is, apparently, the first ever exclusively GAPS cookbook.
Grain-free Foodie contains delicious looking recipes, all GAPS-legal.
GAPSDietThis list is a work in progress. I will continue to add to it as I come across more resources and as they become available. Feel free to post suggestions! I may expand this to it's own forum as I start reviewing possible resources.