Here's a good little tip for users who have trouble locating their mouse pointer on the screen. Windows XP has a nifty little 'mouse sonar' option available, which will cause your mouse pointer to pop-up a little concentric ring around itself to show you where it is.

Go to 'start\control panel\mouse' choose the 'pointer options' tab and check the 'show location of pointer when I press the control key' box.