After just one week in the Apple App Store, the brand-new Barnes & Noble iPhone app has grabbed the number one slot on the "Top Free Apps" list in App Store's "Books" category--unseating two Amazon digital reader applications from the top spots.

With the new Barnes & Noble app, readers can shop, read reviews, and explore web-only extras via smartphone. While these rankings are constantly shifting, the new app has overtaken both the Amazon Kindle for iPhone and Amazon-owned Stanza e-reader in popularity--perhaps a good omen for Barnes & Noble's future in the smartphone market.

Here's the most geeky and interesting feature on the bookselling app, from the release: "Barnes & Noble has partnered with LinkMe Mobile from Evryx Technologies, Inc. and Spotlight Mobile, Inc. so that users can simply snap a photo to search millions of products. Using the iPhone or iPod touch camera, just snap a photo of the front cover and within seconds get product details, editorial reviews, and customer ratings--even find and reserve a copy in the store closest to you."