I sure hope we're not overly reliant on the models or data from CRU for our picture of global warming. Because it seems they are both complete crap. See here, here.
[update Dec 2] While this looks very very bad, it's possible the science coming out of CRU isn't all crap, but there should definitely be some sort of review of their results.
Also there are other sources of good science on this, so lets not lose the plot on climate change altogether.