Also check out clueTips: http://examples.learningjquery.com/62/
However, after also researching, I ended up with this non-jQ solution: http://web-graphics.com/mtarchive/001717.php It's very small, offers 3-d shadow effects, is easy to modify as needed.
~ ~ Dave Sean Catchpole wrote:
The plugins page (http://docs.jquery.com/Plugins) has lots of great scripts. I always recommend checking there first. I recommend http://bassistance.de/jquery-plugins/jquery-plugin-tooltip/ for a tooltip plugin. ~Sean