What are the skinning tools available for the Snow Leopard ?
Mostly, I'm interested on skinning the windows, menus and other elements. I only know of ShapeShifter, but it is old now.
CandyBar skins the Dock and changes icons. Window and menu skinning system-wide is not supported in OSX.
I use Dock Doctor to skin my Dock. It also allows you to toggle between 2D and 3D.