Well, after several rejections have shown up, I've decided to move on to editors. I'm still looking for an agent, but things take so long in this industry, that I've decided not to waste time. I'm encouraged because almost all of the rejections from the agents I received were personal. They all mention in one way or another that I have a good concept, interesting subject and good story line. I know from past experiences that rejections are often impersonal and routine. That's why I feel I've got something going with this book, it is rare to get so many personal responses.
So, I've sent my queries out to a few editors from the spring SCBWI WWA conf.