SC2 has a "Stream artwork" on the admin page. But the documentation (section 4) does not mention this.
Where do we specify the file, and turn on it's display?
There is also "Playing artwork not available" but that is a whole different matter.
[edit - Moderation]
Split from http://forums.winamp.com/showthread.php?t=281192 which was from the v1 DNAS times