Hey Matt,
Glad you guys are thinking of adding it.
One idea though that might work better is instead of adding it to the properties pane, The 'Playing Now' window could be modified so that a display option for the top of the window, instead of Track Info, Visualisations etc, could be: Media Library. That would give us both the library and playing now.
I just think this might work better as for the tracks, we'd have a much wider space and so can see all the track info. The properties page on the other hand is pretty narrow.
If it was done along these lines then maybe take it a step further and make it so that we can choose which screen we want to show in the top or bottom window (using the layout of the 'playing now window' but letting us choose from a range of options what shows in the top and what shows in the bottom.
Options could include: Media Library, Track Info, Slideshow, Visualisations, Playing Now, Playlist Files etc etc.
This would allow us to even use the top and bottom for two seperate playlists which we could drag and drop files between etc. Quite a bit of power
What'd you think? Humanly impossible or a possibility?