DigiDNA SARL has FileApp (iTunes Link) for the iPhone, iPod Touch, iPad in the iTunes App Store for FREE (regularly 99-cents) for a limited time.

FileApp is a file and documents manager for iPhone, iPad and iPod touch. FileApp reads many files types such as PDF, Microsoft Office documents and plays multimedia contents. FileApp will let you store files and folders on your iOS device just like Windows Explorer or the Finder on the Mac.