E-readers are getting better without a doubt. But cheaper? Not so much. The upcoming Spring Design Alex will sell for $359 -- way out of reach for those who cruise the used book store scene. Freescale's i.MX508 processor might finally make these things more of a smart buy, an 800MHz ARM-based chip that includes, among other things, USB host functionality and dedicated circuitry for controlling E-Ink panels. It's effectively a system on a chip for the next-generation of w