I'm thinking along the lines of commenting MS Word-style - highlight some text, and see additional comments for that text in a separate column - in an app like Ulysses or the stock Notes. What I am envisioning is this: I copy an article into an entry. Then, I highlight different words or phrases, and I tack on a translated equivalent for that word or phrase. Eventually, I can see the whole article and I can choose to show or hide all (or select) comments or annotations. I don't care for page layout and separate files. An iPad companion app would also be nice if possible. Price is no issue because this app will get daily, productive use.