If you travel frequently, you'll 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. Still, attached to your MacBook charger it is one less thing you can potentially lose. And seriously, who doesn't like things that combine like Voltron? The PlugBug is $US35 and you can order one now. [TwelveSouth]