ImageFlow is a JavaScript based tool that gives you the same effect Apple CoverFlow in iTunes, only this time on your websites.
The author describes it as:
ImageFlow is a picture gallery, which allows an intuitive image handling. The basic idea is to digitally animate the thumbing through a physical image stack. That intuitive handling is automatically caused by the metaphorical use of the well known process of thumbing through.
Download ImageFlow 0.8
ImageFlow Demo
ImageFlow Documentation