DeskSpace 
DeskSpace dramatically enhances your desktop experience, allowing you to:
      Work and play on multiple desktops.
      Display multiple desktops in stunning 3D.
      Quickly switch between desktops using the mouse and keyboard.
      Drag windows between desktops by moving them to the sides of the screen.
      Display desktops in 3D on multiple monitors.
      Configure the hot keys and mouse buttons used to switch between desktops
      Use DeskSpace in multiple languages.
Screenshots : http://www.otakusoftware.com/deskspace/see/
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TopDesk
TopDesk dramatically enhances your window switching experience, allowing you to:
      Swiftly select a window from an Expose-like or Flip3D-like view thumbnail   view of all
windows, including minimized windows.
      Rapidly switch between an application s windows using a thumbnail view of all windows that
belong to the current application.
      Instantly access the desktop by hiding all windows.
      Find windows faster by displaying window thumbnail titles.
      Manage your windows by closing, minimizing, and restoring window thumbnails.
      Configure the user inputs that display window thumbnails, and change window thumbnail and
performance settings.
      Quickly drag-and-drop items by holding them over window thumbnails.
      Display window thumbnails on multiple monitors.
Screenshots : http://www.otakusoftware.com/topdesk/see/
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