This is a great idea mrbiotech. I read about such a design for a popup in an article that discussed the flaws of the windows interface and the fastest and easiest way to access information with a mouse. A piechart popup allows access to all elements of the popup with only a slight movement of the mouse in any direction. I wish I could remember the address for it as I'm sure a lot of theme developers would find it interesting.

Having too many slices may be a problem unless the circles radius increased to accomodate.

Checkout link 39 on http://www.lo9ic.com/v4/ for similar system using flash.