This lets you control mouse motion (mouse clicks just added!) with an everyday $1 laser pointer from up to 20 feet away (and way, way further if you have a more powerful laser).
When choosing lasers, however, use caution. If you pick a way overpowered green laser (like one that can burn things and set matches on fire), you may end up damaging the optics on your mouse. All cheapo dollar store laser pointers are perfectly safe - just use caution on any laser you need to wear "lasershades" for.
You can read through the whole Instructable or just use the video below... ENJOY!
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NOTE: This Instructable has been updated to include mouse clicking!!! The video has also changed to incorporate this.