TaskbarX gives you control over the position of your taskbar icons.
TaskbarX will give you an original Windows dock like feel. The icons will move to the center or user given position when an icon gets added or removed from the taskbar. You will be given the option to choose between a variety of different animations and change their speeds.
Aerial has the ability to claim spaces on your desktop.
Aerial can claim spaces on your desktop for your docks, widgets or other things. Windows won't maximize over the spaces you claimed.