The past year has seen Griffin introduce "Plus" versions of its earlier charging solutions, and PowerBlock Plus Universal ($30) is the latest offering -- a glossy white wall power adapter with one USB port on the bottom and a pass-through AC output (the "Plus" feature) on its face. Like PowerJolt Plus, the idea is to add a charging solution to an outlet without precluding you from connecting something else to that outlet, as well. The version shown…
