Platform expansion is the logical counter to new competition at the device level. Amazon, facing the introduction of BN.com's Nook and other e-readers this week, has announced it will support reading of Kindle books on Windows 7, Vista and XP Service Pack 2 PCs in November.
The application offers a few enhancements compared to the Kindle device, including a larger number of font sizes and the ability to adjust the number of words per line and zoom capabilities on Windows 7 PCs, as well as supporting cross-device synchronization of last page read, bookmarks, notes and highlights.
Customers can sign up for an email alert that the software has been released at the Kindle for PC page. I've been predicting this for a while, and am not at all surprised to see it come two days after the Nook announcement. It will not be surprising, either, when Kindle books are available on the Mac.
It's all about making the customer library accessible across devices, so that Amazon—and BN.com, etc.—can keep a customer over the long term.
All in a week's brutal competition.