Lately, Roy has been engaged in a little side-project--comparing CRU's surface readings to his satellite data to see how they match up. His preliminary conclusion:
I’ll have to admit I was a little astounded at the agreement between Jones’ and my analyses, especially since I chose a rather ad-hoc method of data screening that was not optimized in any way. Note that the linear temperature trends are essentially identical; the correlation between the monthly anomalies is 0.91.
Furthermore, and more specifically, there seems no evidence of an urban heat island effect:
Of course, an increasing urban heat island effect could still be contaminating both datasets, resulting in a spurious warming trend. Also, when I include years before 1986 in the analysis, the warming trends might start to diverge. But at face value, this plot seems to indicate that the rapid decrease in the number of stations included in the GHCN database in recent years has not caused a spurious warming trend in the Jones dataset — at least not since 1986. Also note that December 2009 was, indeed, a cool month in my analysis.
So: validation from a most unusual source. Unfortunately, the EcoFreako website seems to have disappeared. However, here's a link to MP3s of them playing "Earth Has A Fever" (sung to the tune of "Cat Scratch Fever", and "I Want To Mock Al Gore All Night", sung to the tune of...well, you figure it out.