I was looking for a solution to provide a "fly-in" form when a user would click on a particular button. I found it with the PopupControlExtender. The documentation for Animations with controls is poor so with some testing, I finally got a solution
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Read the complete post at http://weblogs.asp.net/jgaylord/archive/2007/08/10/using-animations-with-the-popupcontrolextender.aspx