Sony and Barnes & Noble are striving to push Amazon and its Kindle from the e-reader throne, but they've found the road a bit more challenging than expected. On Wednesday, Sony said it cannot guarantee the delivery date of its new Daily Edition Reader, but said it expects them to ship Dec. 18 through Jan. 8. Meanwhile, Barnes & Noble has had to delay shipment on the latest orders of its Nook, although it expects they will arrive by Dec. 25. The situation highlights the difficulties of order forecasting and coordination of the supply chain, leaving Amazon in a good position.

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