http://www.americanthinker.com/2010/01/climategate_cru_was_but_the_ti.html
There's a lot of smoking guns in this article but this is the one was just easy for me to understand (and pissed me off). I would really like to see an explanation from these guys for why they cut out all the stations in colder places...
For example, Canada’s reporting stations dropped from 496 in 1989 to 44 in 1991, with the percentage of stations at lower elevations tripling while the numbers of those at higher elevations dropped to one. That’s right: As Smith wrote in his blog, they left “one thermometer for everything north of LAT 65.” And that one resides in a place called Eureka, which has been described as “The Garden Spot of the Arctic” due to its unusually moderate summers.