Your Macbook and iDevice owning customers might find the PlugBug quite useful-- it replaces the removable standard 2-prong adapter and adds a USB port, turning it into a 10W USB charger.

Thus, it allows one to simultaneously charge a Macbook and an iDevice. As a plus, the PlugBug also works as a standard standalone USB charger.

It still has one catch, though-- it is currently only available with a North American-compatible plug. It can still serve European customers crossing the pond by converting international adapters, so not all is lost.

Go PlugBug