This really has been the holiday season for the eReader. Today Barnes & Noble announced that the Nook line of eReaders has become the company’s biggest bestseller ever in almost 40 years. While they did not get into exact details about numbers, they did say that they had sold “millions.”

The NOOKcolor faired well this season and was the company’s best selling gift of the holiday season. Barnes & Noble is selling more digital books than physical books on BN.com.

Despite server problems over the Christmas weekend, Barnes & Noble also reported selling about a million NOOKbooks on Christmas Day alone. The bestselling Nook titles of the holiday season were James Patterson’s Cross Fire, Stieg Larsson’s The Girl with the Dragon Tattoo, The Confession by John Grisham and Decision Points by George W. Bush.