Maybe - I think that the border around the lists is clear enough separation. I agree about the horizontal scrolling, that is why we have multiple queues per col

Maybe - I think that the border around the lists is clear enough separation. I agree about the horizontal scrolling, that is why we have multiple queues per column on the whiteboard. If you have lists with only 2-3 items in them at a time (think WIP limit) then the bottom half of the screen is empty.