Rdio has just upgraded their iOS application with Playlist editing and Reviews.
First up is playlist editing. Now, you can update your playlists from your iPhone or iPod touch — in addition to creating playlists and adding new tracks, you can now remove and rearrange tracks until you’ve made the best playlist ever (or it’s dethroned by your next playlist, of course). You can also customize the playlist artwork, change its visibility and collaboration settings, and more.
The other big addition is reviews. You can now write album and playlist reviews right from the iOS app, and read reviews by critics and other people on Rdio. It’s a great way to see what other listeners think of your favorite albums and let your own voice be heard.