There was recently a really cool spreadsheet added to Excelville.com that lets you do a Kanban Simulation. This is a great way to teach the Lean manufacturing concept of a Kanban or perform a simulation of your current or future process. Check out this video for more info.
Check out the spreadsheet listing while you're at it.
http://www.excelville.com/embed?source=file&size=468×60&qty=1&data=246&cat=&affid=14