To be honest, the full potential of this app was wasted on me for the first few months of use. I use it here and there to read a few PDFs, and that was about it. Recently though, I realized all of the features this app had and was blown away.
For reference to a previous comment, this app DOES let you create folders, just click on the edit button first (Seamed clear enough to me?). From the edit button, you can also mutli-delete, and multi-move files into folders, giving you full organization abilities. You can add files to the app though the server included, or just use itunes to drag and drop multiple files at once! (though the app tab of your device)
Very useful app indeed!