'We are pleased to be making this initial list of outstanding books by some of our top-selling authors available to a ground-breaking group of readers,' Mr Matt Shatz, Random House's vice-president for digital books, said in a statement.

Random House recently announced it was adding thousands of books to its digital catalogue and has said that e-sales more than tripled in 2008, although the electronic market remains a tiny part of the overall book market.

Several other publishers, including Simon & Schuster and HarperCollins, have been making e-books available on iPhones. -- AP