Nook

Barnes & Noble opened an e-bookstore in July, and its editions, which are available in ePub and Adobe PDF versions, can be read on a variety of devices, including Apple's iPhone, the BlackBerry, Macs and PCs. Barnes & Noble will continue to support those devices, as well as forthcoming e-readers from iRex and Plastic Logic.

But it is clear the company is trying to consolidate sales of e-books onto the Nook, which features a six-inch gray and white reading screen and a color touch screen control panel. In any of the chain's 1,300 stores, consumers can download books on the Wi-Fi network. Outside the stores, consumers will access AT&T's 3G network to download books.