Amazon.com announced that it has sold four million Kindle devices in the month of December, or one million a week. The online retailer did not break down those numbers into specific Kindle devices, but one would assume a good portion of those devices were Kindle Fire. The Kindle Fire has held the top spot on its bestseller charts over the holiday season.
On December 15, Amazon announced that Kindles had been tracking at one million devices per week for the preceding three weeks, but very little had been shared about sales before then.
The Kindle Fire seems to be the thrust behind the new numbers. One estimate based on the "1 million sales per week" figure was that the Kindle Fire made up about 780,000 units of each million sold. Amazon reports that the Kindle Touch was the second best-selling product on the site, followed by the "Kindle," the least expensive non-touch, non-3G version of the device.
Source: Ars Technica