Photos: Inside Mac OS X Leopard

Stacks is a new feature that lets you create little folders in the dock that expand when you click on them. You can group all sorts of files or applications together, and it won't take up nearly as much space, or require as much digging to get to the file as it did before. Windows users missing the start button can create their own application launcher by simply dragging all the icons from the applications folder into a new stack.