Tooltip plugin: A grumble can be rotated around a given element at any angle, all 360 degrees. Any distance can be specified. Any CSS style can be applied. There's auto-magic size adjustment for use with localised text. FX queues for animating multiple grumbles. And it works in IE6+, and modern browsers.
CSS3 PIE is a .htc file that faithfully recreates css3 styling in early versions of internet explorer. Simply adding "behavior: url(path/to/PIE.htc);" at the end of the selectors scope that contains the CSS3 rule causes it to render correctly in otherwise unsupported versions of IE.