Got this from http://slashdot.org. Apparently there was a Y2k bug in the processing of the climate data. The warmest year on record was 1934 and 5 of the 10 warmest years occurred before WWII.
Wow, it sounds like the peer review process didn't really work.
NASA has now silently released corrected figures, and the changes are truly astounding. The warmest year on record is now 1934. 1998 (long trumpeted by the media as record-breaking) moves to second place. 1921 takes third. In fact, 5 of the 10 warmest years on record now all occur before World War II. Anthony Watts has put the new data in chart form, along with a more detailed summary of the events.