Some 61 megabytes of data, computer programs and emails was extracted from Britain's Hadley climate research unit and posted on the internet a couple of days ago. The Hadley troops have admitted to the data loss. This blog posts a very damning email admitting to data fudging to avoid showing a temperature decrease. The blog goes on to explain how the data was being "smoothed" to make it "look better".
Smoothing data by computer used to be my day job, so I know a little about it. The discussion in the blog makes no sense at all to me. "Smoothing" can be abused to create "trends" where no real trend is present. I think this true of the Hadley data.
The amount of global warming detected by the warming true believers is only a fraction of a degree. The raw data jumps around more than that. In short, the global warming is not really visible in the raw data, only after the data is "smoothed" heavily does a tiny trend emerge.
It's always best to look at the raw data, on a graph. The human eye is superb at detecting tiny trends. If you cannot see trend by eye looking at the raw data, the trend probably doesn't exist.