On the hunt for an uber-easy way to use your iPhone and/or iPod Touch as a small portable hard disk? Well then, look no further ‘cuz you found it — DigiDNA’s DiskAid. Copy files and directories to/from your device with a few simple clicks, drags, and drops.

DiskAid features:

• DiskAid is a Freeware, 100% free of charge
• PC Windows & Mac OSX compatibility
• Auto detection feature, just plugin it in!
• Copy Files & Folders betwen your iPhone or iPod Touch and your Computer
• Files & Folders Browser
• Features rich file organization including folder creation, renaming… etc.
• No jailbreak needed
• Supported firmware versions : 1.1.1 to 1.1.4

Download:
DiskAid v1.1 (Mac OS X)
DiskAid v1.1 (Windows)

- source: digidna.net