Good for Chris Mooney and good for Climate Audit. Such close attention can help both the IPCC and NASA realize that people are paying attention to their use of information and facts. Knowing that people are paying attention will mean that NASA and IPCC may be less likely to go beyond cherry picking to providing information that is mistaken or mischaracterized. NASA and IPCC (and bloggers as well) should care because if people come to learn that their information providers are playing fast and loose with facts and information, then with some audiences their institutional legitimacy and authority may be placed at risk.
Anytime someone uses facts or information to make an argument, that use is selective. Cherry picking is inevitable. But it is important to recognize that how one uses information can either foster or damage legitimacy and authority (on this, see recent reports on use of intelligence leading to the war in Iraq).