I haven't bought an iPad yet, but I was wondering how the file system works. I know it has Pages, but as far as I know it has no file system, and the only way to get data onto the iPad is through syncing with iTunes? How do I get my word documents into Pages? If I keep word documents and use Dropbox, can I load up the Dropbox app, click a word document and open it and Pages, and save back to Dropbox? How's this all work?