For those who travel alot, they know the less things you have to keep track of, the better. Herein lies the genius of TwelveSouth's PlugBug: it clips onto your MacBook charger and adds a USB port for powering a second device.
In the scheme of things, this may not be entirely more compact than just carrying an iPhone/iPad/smartphone charger around, but attached to your MacBook charger, its one less thing you can potentially lose. And seriously, who doesn't like things that combine like Voltron? The PlugBug is $35 and you can order one now. [TwelveSouth]