Wired has a great list of 10 Snake-Oil Gadgets. What is deeply depressing, however, is the long list of commenters who swear blind that dowsing actually works.
Useless Gadgets
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Reflections on life at “De Witte Wand”…
Reflections on life at “De Witte Wand”…
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Geoff Coupe's Blog 
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