Timer for powerpoint

Once again a smal tool: How do i show a timer in my presentation?
I seem to be having an audience that is absolutely oblivious of the time dimension of things. So I wanted a small timer to show how little time we have left..

A little search and this is what I found:
The best, free and simple to use is this add-in:
http://www.tushar-mehta.com/powerpoint/ppt_timer/ppt-timer.htm
Hats off to Tushar.. and thanks for sharing to (albeit for 30 days :)

There were a lot of shareware available. Not really costly but then ..

And then there were a lot of witty ideas about creating a timer as a ppt, quite different from what I needed, but I loved the ideas. Nice to see how people have thought of using powerpoint for something else.. Here are a few I liked..

The dumbest.. although lucidly presented..
http://www.indezine.com/products/powerpoint/cool/countdown01.html

Nice idea:
http://blogs.msdn.com/andrew_may/archive/2005/01/23/359052.aspx

A little more advanced technique:
http://www.pttinc.com/ppt_faq6.html