Hate to bring up LaLa but since i'm switching over now that its been killed by Apple, I thought i'd mention a couple of features that i found useful.   You could sort your music by recently played, recetly added, and/or recently uploaded.   It would also be great to add the ability to edit song data.   Overall the service is coming along nicely.  Your support is fantastic.  You fixed a problem i was having playback on linux in less than 24 hours.