iExplorer, formerly called iPhone Explorer, lets you use an iPhone or iPad in disk mode, like a flash drive. iExplorer is an iPhone browser or iPad file explorer that runs on Mac & PC that lets you browse the files and folders on your iPhone as if it were a normal USB flash drive or pen drive. You can use the easy drag-and-drop methods to add or remove files and folders from the iPhone.

PC - Version 2.2.1.3
Requires iTunes 10 or later