Looking back on my dealings with KJV-Only folks, I dug up this post: Was Spurgeon KJVO? and especially this quote from Pyromaniacs last year:
We don't normally delve into the debate over Bible versions. The issue seems to attract people who are overzealous or slightly unhinged—and always in a bad mood. Besides, James White's The King James Only Controversy covers all the important ground far better than we could ever say it in blog-post-sized bites.
I agree with Phil regarding the mindset of many of the most fervent King James Only evangelists. They kind of remind me of a lot of Ron Paul supporters. Ron Paul has some great ideas but his biggest weakness is that his most ardent supporters are by and large crackpots. The King James translation is a lovely translation but it gets tainted by frothing at the mouth fundies.