I'm taking my 3G abroad with me for a month to Dublin, London, and Spain. I'm wondering what is the best way to power my 3G. It would be sweet if I could simply use my existing USB cable, but I'm not positive that I would be able to consistently find an available computer to charge from. I of course have Apple's standard USB Power Adapter, but it doesn't fit in foreign outlets. I could buy Apple's UK USB Power Adapter and presumably Spain's as well. Could I simply add an International Power-Plug Adapter to the end of my standard USB Power Adapter? Or is the best option to purchase a portable battery charger?