Tabs have a limit. They are extremely useful until the number of tabs increases beyond a certain point dictated by the increasingly varying screen size of the various apps. Having tabs isn't a bad thing but in many circumstances I think they are inefficient and a hindrance. Here's one possible alternative suggestion for both desktop and web app.
If we could create an ordered Collection, a deck, assign that deck to a panel (an exclusive panel where no other resources will ever open) with a shortcut key, we could flip through the deck using variation on the assigned shortcut key, while maintaining the reference (bible vs, lemma, etc), possibly skipping those resources that don't contain the reference. For example, create a deck of my 17 favorite commentaries in the order I normally consult them, assign it to a panel, smart view, and assign the shortcut E. Then typing E would flip forward through the deck, Shift-E would flip backward, and En (E quickly followed by a number) would move to the nth resource in the deck. (Any vi fans out there?) Ditto for dictionaries, encyclopedia, lexicons, bibles, etc.)
Smart pre-loading and caching could speed loading when moving back and forth to nearby resources while also freeing computer resources by discarding resources further away in the deck.
Another place where ordered collections might be useful is in prioritization. We've always wanted a way to organize the priority list. It's not a perfect fit, but adding a number of resources to a collection and dropping them in the priority list so that they are displayed in a folder would be helpful. I think it'd also be cool if all collections appeared in the Library view as an expandable folder.
Probably a lot of holes in that, but I'd like to see some way of better resources views on smaller devices and on the web platform where things feel more confined.
EDIT: I probably should have put this in the Suggestions forum. I also forgot to note that the Parallels button or fwd/back buttons along with gestures could be used by mouse lovers and mobile devices in the web app to flip the deck.