We have a tradition in our family to award our early readers with a Kindle once they read three chapter books (like Encyclopedia Brown, or Toad and Frog). I find this is a good time to introduce them to all kinds of classics available for free and ebooks from the library. The novelty also helps them forget how challenging the new material is. The Kindle Keyboard is a good option for us because it has a MP3 player for audiobooks and music. RadioShack has kids headphones that will not allow the volume to harm their ears.