There’s a “Recently Added Albums” widget that shows five albums, but I usually add more than that in a batch (I only synchronise between my two computers every now and then) so it’s not so useful for me. But a KDE community forums post tells me that putting added:<1week in the search bar will have the obvious effect. That is bloody awesome.

Also, I’ve just discovered how to randomise the current playlist: “Add a playlist sorting level” (the funny little icon above-left of the playlist itself), “Random”. That’s a killer feature.¹

As if that’s not enough: the latest release apparently adds “labels”² which I’ve been hankering after since pretty much forever.³

Amarok devs: you rock.

Notes:

1. It’s not shuffle: it resorts the current playlist in random order, so you can make your own adjustments as you like. I wonder how it handles appends?
2. Tags, in the sense of “tagcloud”, except they apparently already use that term for track metadata.
3. After five minutes tinkering, I haven’t yet figured out how to use the labels I’ve set, in collection filtering or in dynamic playlists, but I presume I’ll get it sorted eventually.