I really enjoy using this app on the go also. I think that having the ability to work on multiple files would be great. I get that space is a premium. Just thinking how safari works when you open a new page show you a list of current open pages or perhaps how the bookmarks bar is revealed when you tap the address bar. Possible sources of inspiration.

I 2nd this aswell. A Iphone version would be a great additon well worth paying for.