http://reason.com/archives/2014/07/03/did-federal-climate-scientists-fudge-tem
Here's my favorite.
The center's 2009 study conceded that many HCN stations are not ideally situated—that they now sit near parking lots, say, or building HVAC exhausts. Such effects tend to boost recorded temperatures.
Also, they created zombie stations, and inflated the data.
Cue up the JG dancing and dishonesty rants!