Ah the cloud... It is everywhere, right? But what has it done for you lately? Well how about acting like a big hard disk in the sky that is transparently accessible across all your devices: PC, Mac, iPhone, iPad?
Dropbox is the answer. Install the client on your PC and Mac and download the app for your iPhone and iPad and you're away. It looks like a normal drive to your computer and you can edit files directly from it. The client keeps a local copy and synchronizes it to the cloud so your file is the same - everywhere. It is probably the best way to get content on your iPhone or iPad as well.