Just updated Opera Dev. I see, some things I said above are in it already. That's really cool. But now you also can see, that it is really expected 🙂 But what thing I don't like - you killed the space between bookmark folders and "my shared bookmarks". It looks worse. And, again, I really would like to see it somewhere else, maybe in special folder for all of it's kind (with bookmarks panel and express panel).
