Avant Window Navigator is a dock that is designed for Linux. It sits on the bottom of your screen and you can keep track of your open windows. You can customize the dock and change its themes. The dock can be setup to look 3D and you can change the icons effects. Also, it has applets that you can activate to give the dock additonal functionality. You can add weather, system monitor, media control, time and others. If you are using Ubuntu Linux all you have to do is go to Applications, Add/Remove software and search for Avant Window Navigator. Just install and then tweak it to your specifications. Here is their website.