Amazon this morning released a version of its Kindle e-book software that works on Mac computers — a small move, but one that underscores the company’s efforts to maintain its share of the market as Apple launches its iPad.

Although e-books sold for the Kindle are locked into Amazon’s ecosystem, the company is keen to emphasize that they can be read on a number of other devices that allow for Kindle software. In its press release announcing the Kindle for Mac, Amazon pointed out that those devices include PCs, the iPhone, the BlackBerry and “soon the iPad.”

Read the full story at the Wall Street Journal.