The anti-KJV-only folks have some good points, and one should glance over them for some balance, especially since some of the KJV-only sites are so shrill in tone (which I think hurts their case, but then, I'm not a shrill guy.) The main value of the KJV-only sites is their exhaustive documentation of key differences between the Byzantine Greek text-type and the Alexandrian Greek text-type. As we have discussed, what they are defending is the TR, and there are a couple of differences between it and the Majority Byzantine text-type.
One should also keep in mind that the major uncials that make up the backbone of the modern critical school (Siniaticus, Vaticanus, Alexandrinus) differ significantly from each other. Frequently the modern critical texts will have to choose *one* of these readings -- a phrase or word you are reading may be backed up, really, by only one manuscript. The rest of Church through the centuries was reading something else!
I'm afraid I don't understand what this means. :)