Amazon.com today said its latest Kindle eReader is the bestselling product on its U.S. and U.K. Websites.

Without giving specific numbers, Amazon said sales of its new Kindle have already surpassed total devices sales from October through December 2009.

“It’s still October and we’ve already sold more Kindle devices since launch than we did during the entire fourth quarter of last year–astonishing because the fourth quarter is the busiest time of year on Amazon," said Steve Kessel, Senior Vice President, Amazon Kindle.

“It’s clear that this is going to be the biggest holiday for Kindle yet–by far."

In addition, Kindle book unit sales continue to overtake print on Amazon, even while print book sales continue to grow. During the past 30 days, Amazon customers purchased more Kindle books than print books–hardcover and paperback combined–for the top 10, 25, 100, and 1,000 bestselling books on on the site.

"For the top 10 bestselling books on Amazon.com, customers are choosing Kindle books over hardcover and paperback books combined at a rate of greater than 2 to 1. Kindle books are also outselling print books for the top 25, 100, and 1,000 bestsellers–it’s across the board," said Kessel.

"This is remarkable when you consider that we’ve been selling hardcover and paperback books for 15 years, and Kindle books for just 36 months."