Never written a review on amazon before but considering the price Apple charge people for their gear I felt compelled to uncover this bargain. Got this for what worked out to be about 33 euro (less now). Does what is says, charges the iPhone 3G + 3Gs + iPods. Nice rubbery feel to the dock and doesn't slide around much and is very well built. Additional battery charges the iPhone rather rapidly, thought I would have to leave it plugged into it for hours but its nice and fast. Seems solid unlike many others I've used. The only gripe is the cover to shield the 30 pin connector on the battery is useless, no biggie. There is no AV out on the dock so if you want that go find another.
The dock plugs in and charges via the supplied USB cable or supplied USB AC adapter. Strangely, although the USB AC adopter says 5v it charges an iPad as well, at least as fast as Apple's 10v USB adapter. I know, I have both. Thought I was imagining it at 1st but no. So for 33 euro (less now) your getting an iPhone dock, backup battery, usb cable, and an iPad charger which alone Apple charge 30 euro for (no dock to 30-pin cable or extension lead with this though). Really cant say fairer than that. Happy.