The Weather Channel's Greg Forbes blogs that 2006 is the new wildfire record holder for the number of acres burned.
Wildfires in 2006 have now burned a record 8,693,994 acres as of Wednesday morning, September 13, with records kept all the way back to 1960. That acreage is roughly equal to the land areas of Massachusetts, Connecticut, and Rhode Island combined!
You can keep track of the total of burned acres that continues to increase daily by following this statistics page from the National Interagency Fire Center (NIFC). More wildfire stats can be found here.