Why would anyone want a mat that does nothing but charge phones? It's dumb and ugly and takes up space. But an alarm clock that you just set your phone down on to charge it? Yes please.
Once you juice it up wirelessly atop a myGrid inductive charging slab, Duracell's new $35 myGrid USB charger will power pretty much anything that has USB, including smartphones (~4 hours), MP3 players (~30 hours), and ebook readers (~100 hours).