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Vogad: I'm sorry, but you're wrong. 220 is more efficient than 110.
TheBrit: I believe you are saying that higher voltage is safer becasue generally the appliances using 220 draw fewer amps than the same appliances would using 110? The problem with that idea is that you are assuming that if you get shocked with 2 amp appliance you will only get 2 amps through you. That is rarely the case - usually you get much more, generally up to (and beyond if there's a problem with the breaker) the amperage rating of the circuit itself. That 2amp draw the appliance lists means it draws 2 amps when it's working properly, and it also does not mean that the appliance reduces the circuit to only being capable of producing 2 amps. In other words, the appliance is supposed to draw 2 amps, and is "set up" so that it will only draw 2 amps. You are not "set up" to only draw 2 amps, so if the current goes through you instead of the appliance, all bets are off - you'll draw however much current your body has the potential to draw.
Now, the really fun scenario comes when the breaker gets fused. I've seen this happen, and when it's fused it can't shut off. That means you could potentially draw 200 amps (or however high the main breaker is rated). You wouldn't be able to do this for very long because the wire would heat up, catch fire, and eventually snap somewhere. However, it can take less than 1 second for the current to kill you, so that wouldn't help you very much.
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