Liz did not want to scatter her designs all over the store using the category selling approach.

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Roku customers can download the Amazon Cloud Player channel from the Featured or Music category in the Roku Channel Store, for free.

ENGADGET: Amazon Cloud Player arrives for Roku boxes, Samsung Smart TVs

Third-party app stores are the second category of external enterprise app store.

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There are actually instances in which the store brand is the most expensive product in the category.

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It rocketed to number one in the finance category and number four in the overall App Store.

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This new product category is helping bring more customers into its stores and boosting store productivity according to one analyst.

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You won't find many category killers in Japan, since its Large-Scale Retail Store Law still limits the advance of big-box stores.

FORBES: Opiate of the masses

Just as social media has dominated the web for the last few years, it is now poised to have a significant impact in the mobile space, as the study revealed it to be the 3rd largest category of in terms of monthly app revenues in the iOS store, moving up 9 spots over the past year.

FORBES: Social apps rise on mobile

Sexier, but in no less a commodity category, Sephora took on both the over-the-counter department store cosmetic brands and the under-wraps drug store brands and created an open-sell environment as its distinguishing brand factor.

FORBES: Marketers should make a statement and make it stick.