Steve McIntryre's discovery of minor variations in the temperature records has been seized upon by right-wing bloggers as a massive setback for global warming proponents. Hysteria, and political motivations aside, you won't see the following graph on any denier websites:
The red curve includes the revisions, the green curve the old data. The reason you can't see the green curve, is because it doesn't deviate from the new curve. In other words, such a minisule change to the trends, it doesn't even register on the graph. Nothing has changed, except the denier crowd will cling onto this new tidbit, extrapolate and exaggerate, confuse and try to muddy the discussion. Kudos to McIntryre for uncovering a real error, even if turns out to be empirically irrelevant.