Some of you are likely to consider me late to this party, but please indulge me. I recently joined Last.fm, mostly for the purposes of tracking playing statistics, something I find myself oddly interested in.
A while ago, I used My iTunes to place an artists widget on the sidebar of this place, you might have seen it. It broke. I couldn't be bothered to fix it. And so, I went back to having no music widget. Then, as I described above, I got Last.fm.
And I placed the Album Quilt in the sidebar to replace the old Artists Widget. I was pleased with it, it's nice and graphical. It does its job well.
I'm also adding a Recently Listened Tracks widget and Top Artists Overall.
Last.fm kicks ass.