Dock, Magnification...
Also, in the Finder, under Help, type Dock...
Does anyone know how to make the dock effect where when you scroll over an icon it gets bigger, like in this video:
http://video.google.com/videoplay?docid=-560295430272149983&q=leopard+new+dock&total=16&start=0&num=10&so=0&type=search&plindex=0

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