Barnes & Noble Xmas sales driven by digital

<p>Barnes &amp; Noble&#39;s Christmas sales increased by almost 10% in 2010.</p><p>The retailer said its Nook e-book reading device helped it to achieve its biggest ever sales day on 23rd December. Preliminary sales increased by 9.7% for the nine week period ending 1st January 2011.</p><p>A more in-depth update will be issued by the company on 6th January.</p>