I have the same. It's a small tingle when you move your finger over the brushed metal. It feels like the 50Hz buzz. You can feel the same when you plug your computer in a non grounded socket and touch the casing. I have this with many devices and I wouldn't worry about it if I were you. Maybe it has to do with the fact we have 230V (or do you have 110V?) I think because of the 230V there is some induction on the ground wire that leads to the Reader when connected to the charger. With the PSP charger I have it as well.
More people with 230V can confirm this?
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