These days, it’s getting tough for companies that make eBook readers to differentiate. Brief forays into jumbo models aside, Amazon’s Kindle has kept things simple and elegant since day one, while Barnes and Noble went the full-featured Android route with the Nook Color. Sony, to their credit, was among the first to make readers with appeal that extended beyond hardcore techno-literature buffs, and today’s announcement of the ultra-light PRS-T1 shows that they haven’t quite given up the ghost yet.