Plug your cell phone charger into the wall. Feel it. Is it warm? Then like it or not, you're wasting electricity. AT&T would like to change all that with this new Zero charger, a tiny black brick which automatically cuts power to itself whenever your cell phone is disconnected. While it's not quite as amusing as an ejector seat, it's certainly more practical, and the wall wart's modular USB design means you can charge almost any mobile with interchangeable cables (sold separately, of course) while you wait oh-so-patiently for the cellphone industry to finally stop using proprietary ports. If you've got a
