Why doesn't this stuff make the news?
I've read a couple stories regarding a Canadian blogger that managed to call attentions to miscalculations on temperature information beginning in 2000. There was a spike in the data beginning then that didn't match other temperature records.
Apparently NASA has been including incorrect temperature data in their calculations and after pressure has rectified this. The average change is temperatures since this was altered has been a drop by ~0.15C, which now places 1934 as being the hottest year in U.S. history and this correction leaves little of any evidence suggesting that there are any trends in temperature over the last century. Temperatures peaked in the 30s and then dropped again (which led to the Ice Age scares in the 70s and 80s) and have since returned to close to highs (with the resulting Warming scares ... we'll probably be back to worrying about the next Ice Age in a couple decades).