McIntyre programmed his computer using Mann's methodology and entered completely random data into the program. The results, says McIntyre, "was a hockey stick curve."
That was a good hack.
Plus, this piece seems a better overview of the whole debacle than anything I've seen elsewhere.
(Found in the first column of http://www.aldaily.com/, in their second decade of internet service.)
http://www.realclimate.org/index.php/archives/2010/04/climat...