Disclaimer: I did get a discount on these from the distributor, but would have bought them at full price regardless.
Carrying multiple portable, battery driven and USB-chargeable devices is painful. At any given time, I'm carrying 3 cell-phones, at least one tablet & a compact camera. Travelling with chargers for all these things is a nightmare. Thank goodness so many of them are standardizing on being chargeable via USB, and there is some movement on recent devices to standardize on the connector - micro-USB. Except of course for Apple. But even they have an adapter for their ridiculous connector.
But there is still a decent risk that you'll have forgotten to charge one of them. And thats where the Powertraveller Discovery comes in. Its a compact portable battery, that can recharge any of those devices I've mentioned above while on the move. It does what it advertises it does, and comes with a travel pouch/bag, which for me shows a massive amount of consideration around how you protect this thing when you throw it in your bag.
It comes with a set of connectors (micro-, mini-, Motorola, Samsung, Nokia), but I carry around micro-, mini- and Apple dock cables as a matter of course, so don't use the supplied ones.
Highly recommended! Its distributed locally by Wintec Solutions, a bunch of guys who bring in some really neat brands and back it up with great service.