T3Desk allow you to manage applications in a 3D Desktop Environment
T3Desk is fun and useful application you can consider to install on your vista or windows 7 machine. It can be also install on XP machine but T3Desk will feel better when use together with the aero feature found in vista and windows 7. If you are looking for application to replace your Alt-Tab you can try this out too.

After you have install the application on your computer, you will have the ability to to move them around, flip them, zoom in and out, stack on top of each other, control transparency, and more. Instead of the normal left click to minimize the windows, you just need to right click on the minimize button and it will become a 3D window. After that you can use the mouse center button to zoom in and out, left click on them to move them around or stack them on top of each other. Right click on the 3D windows and hold it then move your mouse around will change the 3D windows shape. Simply left click on the windows will restore them back to normal.

Hover your mouse pointer over the icon on the taskbar to get a view of everything that is running.

This is the main menu of the T3Desk application. From here you can manage how its start, tweaking the option to suit your preference, reading the FAQ and more. T3Desk may look like a fun application but it can be use to improve your productivity. Instead of using Alt-Tab to scroll through your windows using T3Desk provide you with a wider view of what current windows is running and in a 3D environment.
via howtogeek