One of the authors, John Baez, has been blogging since before the concept existed. If you're interested in these kinds of topics his _This Week's Finds in Mathematical Physics_ is an amazing resource -- even more amazing that it's usually accessible to those of us who aren't professional physicists.
Oh great, now my brain hurts. Does anyone know of any papers mapping cryptography to category theory? It seems that there could be some interesting results of such a thing, even if it is just reasoning about security protocols in terms of string diagrams.
One of the authors, Baez, wrote "Gauge Fields, Knots, and Gravity" a lovely, cheap, and fairly accessible intro to applications of topology in mathematical physics. Worth a glance if you find yourself wondering about all this