While playing around with Cover Flow view I came across an album which I realised should really be added to one of my existing playlists. I took a notion to see if I could just drag the album cover to the playlist icon in the Source panel (why is this now un-named, incidentally?) and, lo and behold, it worked! This is wonderfully convenient. I dont remember being able to do anything like this before. Wasnt it necessary to select all the tracks first and then drag the selection to the playlist icon?