By Dan Gallagher

SAN FRANCISCO (Dow Jones) -- Amazon.com has launched an application that will allow users of the iPhone and iPod Touch to purchase and read books through the company's Kindle e-book service.

Late Tuesday, Amazon said that it has made a free Kindle application available through the App Store operated by Apple Inc. (AAPL).

Users can download the application free of charge and use it to purchase and read electronic versions of books over the devices. The move is the first to expand Amazon's nascent e-book service beyond the company's own Kindle device, a new version of which was launched last month.

Amazon says it currently has more than 240,000 books available for the Kindle service, including 104 of 112 New York Times' Bestsellers.

Scott Devitt of Stifel Nicolaus, who currently has a buy rating on Amazon's shares, says the move is significant because it reduces the possibility of a smaller device from a competitor gaining traction in the e-book market.

"Amazon has turned its digital book content into an open-source distribution platform," Stifel wrote in a note to clients. "While Kindle was made for reading and it shows, some consumers will find it useful to fill 'wait time' with reading on devices that weren't built for reading like the iPhone."

Shares of Amazon were trading up 2% at $62.91 early Wednesday.