This accomplishes a few things. It brightens the icon so it goes better with the system, adds a drop shadow (*shock!*), corrects the feeble attempt to make an emboss that left it looking like a leaking cup or earl gray tea had been set on it, makes it seem less blurry, and rounds out the edges.
Also, this has a 512 version. For awesome Leopard users like mà.

Enjoi