I was asked to look at the CRU source code to see if the comments looked reasonable to me, so I've gotten myself a bit familiar with this whole "Climategate" bru-ha-ha. I've read a few (knowledgeable) people saying it's nothing, and a few saying it's terrible. If you're thinking of wading in on this, I will say, confidently, that there is little to no chance that you can figure out which camp is right unless you are a professional working in this area. (Which I'm not!)
Nevertheless, many, many amateurs will post on the web extremely strong opinions on this matter. And the funny thing is, in nearly every single case, their opinion will line up exactly with just what they thought about AGW before Climategate! What a remarkable coincidence.