When Amazon released its first-generation Kindle, the company was light years ahead of the market, with virtually no competition for digital readers’ eyeballs. In 2010, though, the e-reader universe is not only set to explode, but it’s also set to fragment. What defines an e-reader? Is it only a device with an electronic paper-like display? Is it a device (tablet or otherwise) that has an LCD screen? Or does software turn any device into an e-Reader?