If you ever asked yourself about the difference between an e-reader and a tablet, your query may have gotten a little bit more difficult to answer. A brand new upgrade for the Nook Color seriously blurs the line between e-reader …

Three days after Amazon declared the third-generation Kindle the best-selling product in its history, Barnes & Noble has responded with a similar claim.  It seems the Nook line of devices now qualifies as Barnes & Noble’s all-time bestseller.

One small nuisance: like Amazon, Barnes & Noble chose not to share any specific sales figures, so don’t think we failed to repeat the number of Nooks that have found their way into consumers’ hands.  The company only said that almost 1 million "NOOKbooks" were sold on Christmas.

Barnes & Noble announced some enhancements to it its Nook e-reading software for the PC, iPhone, iPod Touch, and iPad. There is a completely new app for the iphone and iPod.

"Completely new, the next-generation NOOK for iPhone application delivers the most personalized and easy-to-use eReading experience for iPhone and iPod touch owners," the company says. "NOOK for iPad adds customer-requested, in-app content rating and other improvements to the company’s popular iPad app, and NOOK for PC brings new branding to the company’s desktop software.

As you may know, the digital book war between Amazon and Barnes & Noble has been heating up. Last week, Barnes & Noble announced an important move it is making, adding Nook boutiques to its brick and mortar stores across the country.

The e-book/e-reader wars are really heating up. Amazon has plenty of good news to share around its Kindle device. Now Barnes & Noble is talking about a major push to increase Nook sales.

Barnes & Noble has introduced Nook for Android. This comes in the form of a free app that lets users read eBooks with customizable font styles. The company says this is the first Android eReader app that lets users share eBooks with friends.

The company also points out that this is the first eReader software to feature its new "NOOK-centric" branding. The app will soon be followed up with updated apps for the iPhone, iPad, and other devices.

Borders has launched its own branded eBook store, powered by eReading service Kobo.

The company says its goal is to capture 17 percent of the eBook market by July of 2011. Borders’ eBook store launches with more than 1.5 million titles, available in a number of formats, including ePub, mobile and PDF.

"The race to emerge as a retail leader within the digital category is just starting," said Mike Edwards, Chief Executive Officer for Borders, Inc.

Earlier today, Barnes & Noble revealed a new Wi-Fi version of its Nook eBook reader, and along with that, dropped the price of its 3G version to $199. Not to be outdone, Amazon has now announced that it has dropped the price of its Kindle from $259 to $189.

Barnes and Noble today introduced its Nook Wi-Fi device priced at $149. In addition, the 3G version of the Nook has been lowered to $199.

The company notes that the new Nook 3G price marks the first under $200 dedicated full-feature eBook reader that offers both free 3G wireless and Wi-Fi connectivity. It also now has a new software update that is supposed to make it easier to connect in more places via Wi-Fi.

While eReaders are still becoming mainstream, the Amazon Kindle leads its competitors in brand recognition, with 61 percent of consumers having heard of the device, according to a new report from PriceGrabber.

More than half (55%) of consumers said they had heard of the Apple iPad. Thirty-four percent indicated they had heard of the Sony Reader, and 28 percent of consumers were aware of the Barnes & Noble nook.

Barnes & Noble said today its nook e-reader is now in stock online and will be rolling out in the majority of its stores by mid-week.

Barnes & Noble sold out of nook stock online over the holidays due to high demand, which exceeded the bookseller’s expectations. Since then the company has ramped up production and is shipping stock to most of its stores this week. Customers can visit the Barnes & Noble nook In-Store Locator to find local stores with the device in-stock.

Owners of e-readers such as the Kindle report they are happy with their devices according to a new study by The NPD Group.

The majority (93%) of owners said they were "very satisfied" or "somewhat satisfied" with their device. Only 2 percent indicated any level of dissatisfaction.

Features are important to e-reader owners. More than half (60%) said wireless access was their favorite feature on their e-reader and nearly a quarter (23%) mentioned touch.

Amazon.com has announced that December has been the best month for sales of its Kindle electronic book reader.

The company did not provide any sales figures or comparisons for its Kindle, but did say it is the most wished for, and most gifted item across all of Amazon.

Sony said today it will begin offering subscriptions to The Wall Street Journal and MarketWatch on its new electronic reader.

In addition, Sony will also offer subscriptions to the digital version of the New York Post on its e-reader.

Amazon announced that its Kindle device, an electronic reader, has broken its record for sales in a single month, during November. This information does not even take into account Cyber Monday, which is today.

The company says that the Kindle is the most "wished" for, the most "gifted," and the number one best-selling product across all product categories on Amazon.com.

Barnes & Noble said today it has sold out of its new nook e-reader due to high demand and shipments will not arrive in time for Christmas.

“nook continues to be the fastest-selling product at Barnes & Noble, and pre-orders have continued to exceed our expectations,” Barnes & Noble said on its eReading blog.