DataCase: turn your iPhone into a wireless drive

The app, which costs $6.99, turn your iPhone into an easy-to-use wireless storage device that can be access by any other device on your wireless network. A one way drop box can be added to a normal machine to drop files onto the iPhone, or alternatively you can set up a two-way shared drive to move files between the iPhone and a computer. More info on developer's website.

Here are couple videos, one for PC and one for Mac: