I agree with those who ask for the ability to sort alphabetically, by date added, by song, etc. Also, I agree that a notification of a duplicate track being added would be very helpful. C'mon Pandora, Spotify offers these options, so you should do it too. Make me gladder I switched over here.
This post has been open for almost 3 years. Spotify has had this feature that whole time. I left Spotify because the radio with them is not that good but the fact that I can't sort my playlists is enough to make me switch back. 3....Years.....
I agree with chocobogrove818 , the members have been asking for sorting features for years and nothing has been done. I've resigned myself to the fact that nothing will be done until another competitor comes on the scene who will offer more features.