Previously, PowerDocks were Apple device-specific. The series began with June 2008’s twin iPhone/iPod-charging station PowerDock 2, then continued with December 2008’s four-dock PowerDock 4, and late 2010’s one-iPad, one iPhone/iPod PowerDock Dual. Griffin’s first two PowerDocks were handsome $50-$70 brushed metal and plastic trays designed to manage your pocket devices without cable clutter; the subsequent $60 PowerDock…