Hey, here’s another really cool prog although it’s -only- a widget really. It’s called iTunes Companion and it does the following:
It automatically grabs the album title of the song your currently playing and looks for the fitting album art on amazon and google (if you don’t have it already of course). Then it puts it in its own window and even adds it to the file so you can see it in iTunes. Furthermore it collects the release year and the lyrics optionally and also pastes them into the music file. All you need to do is listen to your favourite music as all this happens in the background. Of course it can fully remote control your iPod as well. Unfortuneately this Widget can only be used after you installed the Yahoo! Widget Engine (I was really surprised to find something like this coming from Yahoo! rather then from this other big search engine…). However it’s quite a neat extension and you should give it a try.