There are no hard numbers on ereader sales from any vendor.
I'll start with the smaller, but known e-readers:
several hundred thousand Kobo's activated daily starting 12/24/2010.
Then some positive rumors on Sony:
Rumors that Sonly sold 2 million ereaders in 2010
Which gives credence to the 8 million Kindles sold this year. It also puts Nook sales at 3 to 4 million for 2010. Time for B&N to upgrade the servers. ;) I personally didn't think the Nook color would do as well as it did. Kudos to those who anticipated the market. :)
Assuming "hundreds of thousands activated each day" for Kobo probably translates to 500,000 for Christmas... 12/28 Update: They've claimed a million activations. We're looking at 14 to 15 million e-readers sold in 2010. Most of the sales would have been for the holiday season. So we shouldn't have seen any uptick in sales before mid-November. Chanukah was December 2nd through 9th, so there should have been a nice 'spike' right after that.
I've very curious what the 12/24/2010 through today (12/27/2010) Amazon ebook sales.
I hope some of the authors noted sales by day and blog that information. Any links are appreciated.
The ebook revolution set its tap root this year. The growth from now through 2013 should be excellent. Good luck to all the authors. Only now do we have enough 'e-readers in the wild' to launch the market. Kudos to the pathfinders.