Hi Sribeiro,
There are some sites where you can get them.
Check this out:
"Clocks and timers for PowerPoint" http://www.rdpslides.com/pptfaq/FAQ00081.htm
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==================== http://www.pptheaven.xs3.com
PowerPoint Heaven - The Power to Animate
Contains tutorials on creating amazing animations for your PowerPoint
Presentations.
====================
