Another major scientific voice--Nature's editorial page--has now come out stating that the Swifthack affair has no impact on the credibility of mainstream climate science:
Nothing in the e-mails undermines the scientific case that global warming is real — or that human activities are almost certainly the cause. That case is supported by multiple, robust lines of evidence, including several that are completely independent of the climate reconstructions debated in the e-mails.
The stolen e-mails have prompted queries about whether Nature will investigate some of the researchers' own papers. One e-mail talked of displaying the data using a 'trick' — slang for a clever (and legitimate) technique, but a word that denialists have used to accuse the researchers of fabricating their results. It is Nature's policy to investigate such matters if there are substantive reasons for concern, but nothing we have seen so far in the e-mails qualifies.
From people familiar with modern climate science and the robustness of its conclusions, I can confidently predict that this message will continue to be echoed. You can read the full Nature editorial here.