I've been playing with jquery.corners.js and like it. Seems to work well. The only gotcha is that it doesn't seem to support the rounding of objects that are using a background image in IE.
In IE, it 'adds' to the top of the object to create the rounded corners, and moves the background image down. Anyone know if that's user error on my part, or, if it is an issue with that particular plugin, if there's another plugin that will accommodate the rounding of objects in IE that use background images? -DA