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Can I get a 3G data card that will work in USA and Brazil?
Check your carrier before you sign up to make sure they roam in Brazil. Even so, it's going to be expensive for a world plan. It might be better to just wait until you get to Brazil to get the card, or go with a prepaid card in the US for six months and then get a new card in Brazil.
Links we mentioned
Belarc Advisor inventories your computer specs and software for free.
List of VoIP apps for iPod Touch.