USBFever has already proposed lenses to transform the picture of the iPhone, including a macro lens for li'Phone V1 and 3G do not have opportunity to shoot up close. This time, the accessory that they offer can take pictures and videos with up to 8x zoom.
The accessory consists of a box iPhone which is added a zoom and a camera tripod:
Here are video images obtained with and without zoom:
expect $ 29 without shipping.