Books 1 and 2 originally started out as one volume. My brother convinced me that the manuscript was too long, and advised me to split it into two separate volumes. This was, of course, prior to my writing book 3 of the series, which is nearly as long as one and two put together.
Another interesting tidbit about volume two was that the Captain Jon Campbell chapters were not in the original text. My primary editor, and good friend, Eric Adelizzi, convinced me to include them. He rightly pointed out that Do the Gods Despise Us? did not include any chapters from the humans of Kentar point of view. Now, of course, it is difficult to imagine book two without the initial two chapters and final climax told from Jon's point of view. The story for these four chapters came together much quicker than the rest of the plot and were some of my favorites to write. They have a humor that is not found in the rest of the volume and the prose are quite possibly better written.
As the writing for Book #2 came to a close, it became clear to me that I needed a title for the entire series. Where would George R.R. Martin be today if he hadn't come up with the name A Song of Ice and Fire? It was actually my primary editor who came up with the overall series name A Prayer for Peace. He and I were kicking around all sorts of ideas, and when the series name came off his tongue, I knew he had captured the sentiments I was looking for.