dropping of items into folders complicated by blue on blue coloring
When sorting library items into folders, it is hard to realise whether the item will actually fall into a folder or end up in the dead space between two adjacent folders and not actually be associated. This is because when one drags an item it is colored in blue. The confirmation that a folder is targetted is also a blue highlight. This color scheme needs to change for easier drag and drop. I'd favour not highlighting the item being dragged.
On OS X highlight is blue and drag highlight is gray.