How do I rotate an image?

FROM : Mac Man
DATE : Tue Jan 29 20:10:21 2008

I am trying to rotate an image along the z-axis, to get a perspective change
like the Dock appears in Leopard.  If I have a rectangular image, is there
an easy way to rotate it to achieve this?  I thought that I might find some
luck with CATransform3D, but the documentation I've encountered didn't do
much to help, and I couldn't find any clear examples of how to do this.  If
it can be done without Core Animation, that would work as well.  Any insight
and help would be greatly appreciated!
Thanks,
Devon