Use Your iPhone or iPod Touch As a Memory Stick

Memory Stick lets you use your iPhone or iPod Touch for storing and viewing files or for transferring files between two computers. Using Memory Stick, you can access your iPhone or iPod Touch just like you would a network drive from either Windows Vista, Windows XP or a Mac. You can copy files to and from the device simply by dragging and dropping files from within Windows Explorer or Mac Finder. Your iPhone or iPod Touch simply needs to be available on the network via its wi-fi capability.

To copy files to and from the iPhone, open the Memory Stick application and press the File Sharing button in the bottom toolbar.

In the page that is then shown, ensure that the File Sharing switch is set to ON. Shortly afterwards, just underneath the switch, the iPhone’s IP address and the Bonjour address will be shown.

The IP address is needed if you are accessing the iPhone from Windows. Either the IP address or the Bonjour address may be used if accessing the iPhone from a MAC (note that if you are accessing the iPhone from a MAC, the bonjour address will be more convenient since unlike the IP address, it will always remain the same).

Once File Sharing is enabled, you may connect to the phone either from a web browser, or by accessing the phone as a drive from within Windows Explorer or the Finder application (or indeed any webDAV client).

For more info on how to use this app with Mac OSX , Windows Vista or Windows XP check this link
Download .ipa file from here