I really like the "hint.css" thing, its really a cool package in CSS only.
We at SDSLabs use "hint.css" in our
Play : an internal music server like Github's
Play
I wanted to have a cool looking tooltip library triggered by an event not just 'hover'.
and found "hint.css" as the right option, because of its simpleness an coolness.
so I hakced on it with jquery and managed to get thing done and shaped it to trigger on event "adding a song to queue" or simply a click..
It will be great if you can power it to support events :)