Rotate an Object Using the Mouse

A brief tutorial (including a short script, which I've linked to below) explaining how to rotate an object in Unity3D. There's plenty of ways to rotate an object, but the method I used in the video was selected to break it down into piecemeal steps so anyone new to programming reading the code has a better chance of understanding what's going on if they tinker with it. The script used to rotate an object: http://pastebin.com/TYXsRL5t