Some people have criticized Amazon for essentially making the Kindle a "closed" e-book reader system. However, word from Yahoo Finance is that it might not be so closed after all and that Amazon will be making its Kindle books available on a wide variety of mobile phones in the near future. At this point, it's unclear whether it will be offering up all its Kindle titles (the Kindle Store currently has about 230,000 e-books for sale) or just a fraction of them.