I've noticed that when I'm charging my iPad, when I hold it or put my hand on it, I can feel an electrical current on the case; it feels like a tingling sensation. Apparently, this is only an issue with the UK chargers which don't have an actual grounding plug. I'm starting to think that this may be dangerous? In the same way that a metal kettle must be grounded in case there's a short circuit, surely the iPad, with it's aluminium body, should be? Apparently, if the transformer in the power brick fails then a full amperage could be conducted through the iPad, and, if I'm holding it, through me? Should I be alarmed at this power adapter problem?