I know this is going to sound weird to think about, but consider about if you are going to want this distributed to libraries or not. I agree that a book that lays flat is nice, but wire bound books are not enthusiastically welcomed by libraries because of the difficulty of keeping them shelved in the right place. They are also a big pain because the wires work loose (either naturally or with help from destructive little hands), get caught on things, and the book doesn't hold up with use (the pages start tearing as they are pulled against the wires). Be sure the book doesn't depend a 100% on a CD (it would be better if there was a stable website to link to) because, inevitably, CD's get lost, stolen or damaged, especially in a public library setting. And you will want this in libraries because it would be a good reference tool for them, and people who see a book in a library, and like it, will often buy it for their own collections. At least I do. :)