Restoration Hardware has an interesting item called Roll Up Travel Charger, a charger for the traveler where they can roll it up to save space while still providing enough ports to charge several gadgets simultaneously. Up to 4 gadgets can be charged at once, and it has come with 4 different connectors for various devices, including iPhone, MicroUSB, Mini USB and for Samsung phone.
This Roll up travel Charger is powered by a single source via AC adapter. Each port has its own on/off light indicator, and a high grade non-slip polyurethane mat as the protector of the charger while you store it on your bag or suitcase.
If you are interested, you can get it at Restoration Hardware for $49 each.