Portable p2p

  I always got irritated to wait for my friend to return a pendrive which i gave him to copy something from his computer. I dreamt of a device which would have a harddisk(160 gb) in it like ipod. It has a user interface which can detect (no need to read files) all files in the harddisk. You can connect through a cable or wirelessly to your friends device to share files at your and your friends will. Must have a small screen, external/internal battery pack, external harddisk or harddisk based device connector to read and copy its contents standalone. This device must be cheap so that everyone could posses one.