Ho! Ho! Ho!
A gift from me to you! Well, it's not much of a gift, but it's the gesture that counts!
Here's a gift function I wrote recently:
It helps you identify 'stale' user and computer accounts. It also allows you to disable those accounts and move them to an OU of your choice.
Before you unwrap your present I would advise having a read of this great article by Ken Brumfield: