ralfonso/theory — pull request #7 by wiewiewicher (2012-04-18 12:55:47+00:00)
Title: Album art / artist art via Last.fm API

Peacefully coexists with the amazon.com album art infra (which didn't work for me anymore, it seems to need an "associate tag" now and btw, as you probably know, the registration process for an amazon developer key is 1½ bitches).