Have you ever wondered exactly why Apple's tiny USB Power Adapter for the iPhone has such a large price tag? The diminutive cube costs US$29.00, while similar USB wall chargers are available from retailers like Monoprice for as little as $6. Ken Shirriff wondered the same thing, so he went all iFixit on one of the Apple chargers and tore it to pieces to see what's inside.
Shirriff found that there's a reason for at least part of the premium price tag, and that's the use of quality components. To