CSS3 Pie Utility Allows Creation of IE Friendly Code
CSS3 Pie is a library that creates DHTML behaviors that IE is able to interpret. It essentially "translates" some CSS decorations, such as border-radius, border-image, box-shadow, multiple background images and gradient backgrounds.
The site is currently just a demonstration that Johnson has created to showcase his work, but it will eventually become a useful utility, if he continues to update it. With IE9's release looming in the future, he better hurry up.