Switched On: Nook tablet, an epilogue

Each week Ross Rubin contributes Switched On, a column about consumer technology. The recent announcement by Barnes & Noble that it would discontinue its Nook tablets marked the exit of what once promised to be a strong rival to Amazon, at least among bibliophiles. Barnes & Noble's entry into the tablet market took place amidst an annual game of leapfrog with its internet-based rival. Surviving for three iterations, the color Nook devices were products that had a particular focus on media consum...