This is an out of the box most required feature for Microsoft Office 2010 PowerPoint lovers. If you ever forget to carry your laser pen or just don’t want to carry it more, use CTRL Then Left Click in sequence, keeping your powerpoint open, and you will see a red colour laser dot instead of mouse pointer. So now till you hold your click the laser pointer will be there. You can choose the colour for the pointer and make sure it is visibl when you move it over your slide.
I wish it was possible to set the size or thickness of the laser pointer which will me more useful. Below is a small animation of using mouse pointer as laser.