Amazon.com has announced that a number of Christian publishers-Augsburg Fortress, Crossway Books & Bibles, David C. Cook, Gospel Light, Group Publishing, NavPress, Strang Communications, Thomas Nelson, Tyndale House Publishers, Wm. B. Eerdmans Publishing Co. and Zondervan-have committed to making the majority of their book catalogs available by the end of this year to owners of Kindle, Amazon's portable digital reader.

"Of the 135,000 books available on Amazon.com as a physical book and on Kindle, Kindle books already account for over 12% of units sold," said Ian Freed, vice president of Amazon Kindle. "We're pleased that so many publishers are seeing this success with their Kindle titles, and that more publishers like the Christian book publishers are getting on board."

"The response to our Kindle editions has been remarkable," said Alan Huizenga, director of digital publishing at Tyndale House Publishers. "We are excited to know that for readers who own a Kindle, they can download and begin reading best-selling Tyndale authors such as Joel Rosenberg, Tony Dungy, Francine Rivers and Tommy Newberry in under a minute."

"For years Eerdmans readers have enjoyed our extensive selection of titles from the scholarly to the popular," said Sam Eerdmans, vice president of sales and marketing for Eerdmans. "Now Eerdmans is excited to announce that many of our titles will be readily available on Kindle."

Amazon has increased the number of books available on Kindle from 90,000 to 135,000 since it was introduced last November, with more being added every day.