Join Date: Jul 2001
Location: Near Pittsburgh, Pennsylvania, USA, Earth (PIT)
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Posts: 5,277
A USB is a USB, so that is fine. The important part is for the INPUT to be capable of 240v AC as well as the typical 120v for N. America.
Carrying a power transformer is usually a waste. They're heavy and unnecessary for anything most people need to take on a trip. What you need is the adapter plug(s), to change the prongs to the right configuration.
The Blackberry and iPod bricks (or any other generic brick that plugs into the wall and gives you a USB port) should have a power spec on them (not the devices themselves, look on the power supply brick). Take whichever one says it allows for something like "108-240v AC 50-60Hz" and is smaller and lighter. The 240 is the operative number. If it stops at 120, it will be fried by European circuits.
The standard Apple ones for the iPod (and all their laptops) are rated for the dual voltage, so if this is an Apple part it should be fine, but it's always good to double check on the brick.