As Kindle versions outsell hardcover editions of some best sellers, the publishing industry, hot on the heels of the music and movie industries, is scrambling to envision and develop a model that will actually work. Libraries are feeling the heat, too, because many of these early e-reading platforms, which combine a large online bookstore, a rapid and easy-to-use distribution system, and a portable reading device into a complete reading experience, seem to be eliminating libraries from the equation.