In the IPCC case, there was an active truncation of “inconvenient” data which had the effect of concealing a mismatch from the reader. Worse, the matter was clearly and explicitly brought to IPCC’s attention and they refused to address the concealing.
In Pierrehumbert’s words, there was no “legitimate reason” for what IPCC did, but a “very good illegitimate reason”. It’s gratifying that Pierrehumbert and realclimate are lending their authority to the condemnation of such practices.
Climate Audit is written by Steve McIntyre who, with environmental economist Ross McKitrick, comprehensively annihilated one of the IPCC's main planks: the Mann "hockey-stick graph".
McIntyre was also responsible for NASA's recent... ahem... correction of their temperature figures which showed that it was, in fact, the 1930s that was the warmest decade of the last century and not, as had been promulgated by the AGW liars, the 1990s (and 1934 the warmest year and not 1998).