AeroSnap is a small free tool which allows you to experience windows 7 aero snap feature in windows vista and XP, We had previously written about windows 7 snap feature. This application is still in beta, but it works well to implement snap feature in vista and XP [ as shown in the video below ]
Here is how to use AeroSnap feature in windows XP / Vista
AeroSnap is a simple but powerful application that allows you to resize, arrange or maximize your desktop windows with just drag’n’drop. Simple drag a window to a side of your desktop to snap it or drag it to the top to maximize. When you drag it back to the last position, the last window size will be restored.
Download AeroSnap to add snap features in vista and XP