It's a good idea but it won't / can't replace the mini and micro-usb connections that are becoming standard.
I for one would not buy something that only had an inductive charger since it wouldn't be convenient to use in the car or when traveling.
I'm guessing that the extra 'stuff' adds cost and weight that most companies don't want.
At a minimum you would need a coil of wire wound on some sort of ferrite or iron compound to couple to the base station. Depending on the amount of power and placement flexibility you're looking for, the physical size and weight could be substantial compared to the sizes of some of the devices we're talking about.
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