I don't have a Mac but I do have a Galaxy S. I have installed a samba server on my phone (free app from Google Play), whenever I want to transfer files from the phone to the tablet I just turn on the server on the Galaxy and browse the files from the iPad samba client (Goodreader). As a matter of fact, I have all my devices (desktop, laptop, phone, iPad and raspberry pi) linked through a samba network thus sharing files among them is as easy as it gets.