Radio electronics had an project quite some time ago that used this 
method.  It was a laser pointer (back when the red laser diode was $70 - 
for the cheapie) with three nicads and a charging coil.  The charging 
base was even simpler.  If there's a lot of interest I can try to find 
it and scan the schematic.

-Adam

Mike Hord wrote:

>My wife and I just bought a Sonicare Elite ultrasonic electric
>toothbrush.  Unpacking it, I discovered that the charging unit
>and the toothbrush base unit have no charging contacts!
>
>Apparently, the charger works through induction.
>
>Unfortunately, as this is a new item at $120, I doubt my wife
>will let me fiddle with it too much, even if I *promise* I can 
>put it back together.
>
>Mike H.
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