Find all users (or computers) mapped to a specific printer

I’d like to figure out which users or computers are mapped to a specific network printer. Would anyone mind assisting me in figuring out how to do this? I understand that I can find mapped printers in the user hive in reg, but am looking for a way to automate the search.

Is this putting me on the right track? – http://powershell.com/cs/media/p/16643.aspx