Briefcase is just another file storage all for the iPhone. Like AirSharing, TouchFS, MobileFinder, etc. However, this app does not use the normal disk drive mounting via WiFi, but allows Remote Login to a PC or Mac using SSH. So, you can grab a file from your Server or PC emotely and even open files or mount images on your computer from your iPhone. Besides this, its also the first iPhone app to allow files transfers between two iPhones.