Hmm.. I tried hovering an MP3 to see info, but no dice:

http://www.skreemr.com/results.jsp?q=test

Any chance of getting the balloon to follow the cursor like the excellent LinkThumb (http://userscripts.org/scripts/show/23031)?

Also, any chance of a way to disable the script for images in order to use the two together?

I made some tweaks to the styling here:

http://userstyles.org/styles/5926

This script doesn't appear to work on Greasemonkey for me, so I've created a Greasemonkey script that does a similar thing, you can find this here.

There's a glitch in this:

When you mouse over the title in a Snap Shot?, another Snap Shot? appears for it.