Recently, while attempting to update 2009 records for statewide, all-time, monthly minimum and maximum records, I ran across the problem that information seemed to be missing from the 1st quarter of 2009. That fact would have passed without notice except that I was looking for the January 2009 all-time record for Maine which had been verified at -50F. Subsequently, it was revealed that the NCDC records were not necessarily complete simply because not all weather stations that are considered "official" are included in the database. Maine's station was one of those.
NOAA did rerun the 1st quarter to include the missing data for the summary reports. Of course, this does not necessarily mean that all of the other reports for 2009 were updated or even needed to be updated since NOAA could not explain why they were missing from the summaries in the first place. It is possible that all of the other analysis for the year was done with all of the records; it is also possible that all of the 2009 analysis might be incorrect because approximately 1/10th of the data from cold periods was excluded. We probably will never know... and that is not reassuring.
Meanwhile, the people at www.icecap.us [scroll down to "Climate-gate Redux"] had prepared a blistering report about the whole "Climategate" fiasco... blaming a large part of it on NOAA. That was followed up by Anthony Watts' reporting how of of NOAA's top managers had misused information about weather station site quality to dismiss the notion that there was a problem with the quality of those site... something that the site survey showed exactly the opposite.