Briefcase Lite

Free application lets you connect your iPhone to Mac and Linux in a network of (sorry, Windows is not supported), you can transfer or get the file from your iPhone and use it as a hard drive to store any file you want to do.

However, besides limitations does not support Windows, this gadget also have 1 more restrictions that do not support the move, meaning you can only move or copy a file, the directory is not. This means that if you have many files, you have to move or copy a respectively, instead of containing all in 1 folder. However, this is not really important if you do not work with data too large and the number of files too.