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maybe it's because I've revealed there is 240V available in most US hotels rooms?

If I was travelling to the US, rather than take a step up transformer, I'd make an adaptor consisting of an Australian extension cord socket fitted with two long wires; each connecting to the live pin of a US plug (use polarised or 3 pin plugs). The idea is that you insert the two US plugs into GPO's around the room in a random manner until you found two on separate phases; ie. 240V. If you needed an earth then one of the plugs would need to be 3 pin and the relevant connection made to the 240v socket.
I wouldn't recommend this for non technical users....if an appliance was plugged into this adaptor and turned on before with only one 120V plug inserted, then a shock could be received by touching the other, non inserted plug.

[This message has been edited by aussie240 (edited 10-20-2005).]