If you want to edit or view files on your iPhone or iPod Touch, you used to have to Jailbrake the device and install 
OpenSSH and access the files wirelessly, but now there is a way to access the file system without having to jailbrake.
It doesn’t give you as much power as using OpenSSH but allows you to copy and paste things to and from your device.
DiskAid is a freeware application for Windows & Mac OS X, it supports both gen iPhones and both gen iPod Touchs. It will automatically detect your device, just plug in and go. It’s as simple as drag and droping the files. And it supports Firmware 1.1.1 to 2.2.
Sam's Blog 
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