One of the new additions which are noteworthy to mention for Amarok 2.1 is the introduction of the classic playlist (the one from 1.4) and also the playlist editor.
Amarok 2.1 - Changed widgets interface
The playlist can still be a mess, with songs from albums mixed throughout the entire playlist or compilations which are shown separately for each individual artist. Still, there is no keyboard shortcut to search through the playlist (like Alt+E in Amarok 1.4). There is now an Update Collection option under the Tools menu, just like in 1.4, so you won't need to rescan the collection each time you add some new music to it.
The good thing about this release is that users who liked more the older, classic playlist can switch to it now. Besides this, there is also a playlist editor available, which lets you decide which fields are shown and which not: