Full-screen count down app?

[goodtimes5]

How would I go about creating a countdown from some arbitrary time, such as 15 minutes, to count down on my screen?

We're giving a group presentation in class, and I would like to use this count down as a guide our speed.

Anyone know of such an app?

 

[MikePearce]

Hi,

It's not fullscreen, but I was looking for the same thing this morning and found this: http://www.baldgeeks.com/3-2-1.htm

HTH!

Mike