Now here's an application that your iphone can be used as a drive like the ipod's im sure many of you is familiar about it..
USB Drive for the iPhone platform (CE2I to name it short) let you use iPhone or iPod Touch as USB Mass Storage device.
it is a beta release so expect bug on it just read the text for the important information...
USB Mass Storage protocol is widely supported by modern operation systems and consumer devices, USB thumb drives and photo cameras are good examples of devices which implement USB Mass Storage protocol. Since this device class is likely supported by your operation system you do not need any additional drivers or complex (read: any) setup, this makes information exchange much easier.
USB Drive let you create one or more virtual disks for use as USB Mass Storage volume, thus you can allocate some of your iPhone space to carry desktop files with you.
The 2nd beta is available from by adding the following source to Cydia
add this source: http//apt.dmytro.me