My Kindle was one of the first batches since I preordered it very early and I've been using it nearly every day so far. No cracks that I can see on this one but its possible that some of the casings weren't correctly made and you're seeing a seam open up caused by how the plastic was injected.
B00A is the European/International version of the Kindle 3G+WiFi. It just has a different SIM inside. B006 has AT&T and the B00A has Vodafone. They're the same apart from that.
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