Can't find anything about this. It would be cool to be able to compare which mediafiles that have been transferred to either a playlist or a device. So if You fx have a view where You have a filter where You can see all Your mediafiles, and a filter named "Compare to", where You can choose the element You want to compare to (fx a playlist or a device). Then some indications would show weather You have the mediafile in the element or not.
Well, theres several ways to do I guess, and this is just one way I could think off.
Would love this feature