Aero Peek is a cool and unique feature on Windows 7. Let me tell about it shortly. This is found as a small rectangle present last on the Windows 7 taskbar.
When you hover your mouse cursor over it you can see through all the maximized widows ie. all the maximized windows becomes transparent and only their outline will be showed.
A small application created by GeeQ can bring this effect in Windows XP and Windows Vista too. So from now on all the XP and Vista users also can enjoy this unique Windows 7 feature.
To use it click on the icon in the system tray and Desktop preview will be activated to disable double click it.