Related?
New Light on the Black Death
http://www.amazon.com/Light-Black-Death-Mike-Baillie/dp/0752435981/ref=sr_1_2?s=books&ie=UTF8&qid=1318399002&sr=1-2
http://en.wikipedia.org/wiki/Mike_Baillie
I don't think so. This guy seems to be arguing that it came to us like in that movie about the pod people. ;-)
Tree-ring patterns are intellectual property, not climate data