I don't have much need for the AC charger, it charges extremely fast via the USB cable and I'm almost always at or near my computer. For other people who are more on-the-go, the AC adapter may work better, though if you take a laptop with you, the USB cable charging could still come in handy.
I know that plugging a USB device into the same port each time helped them get recognized/ready a bit faster and avoid issues when I ran XP, but since I switched to Vista I don't think that's been a problem.
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