3-in-1 USB Charging Cable for NDS/NDSi/NDS Lite

Pros: Good quality, firm wiring which allows you to charge many different devices simultaneously on a single USB port.
Useful for traveling: charge all of your devices in any computer (no drivers necessary). No lugging along many different cables and having to charge them all in several power outlets.
It's rather compact, meaning you can store it rather easily.
It's USB, so you could even charge (or use) your devices while traveling as long as your laptop has battery power left. :)

Cons: Well, it's USB, so you'll probably need a computer nearby to charge your devices, and that means you have to offer up a free USB port when charging anything. Unless you also buy one of those USB power outlet adapters (yes, those exist).

Other: A very useful little cable allowing you to charge many (as described) devices at once. Excellent build quality, great price.