I've recently needed to display products in 3D. It is a quite often requested feature, especially for commercial web sites, where items need to be shown from different perspectives.
Different solutions are available, but they usually contemplate the use of Flash or Java Applets. I must say, I don't like that kind of tools, especially Flash, because they require the installation of specific plugins on the client machine.
What I've found is a remarkable script that I would like to share: 3D rotating images.
The author (Mark "Tarquin" Wilton-Jones) explains the script thoroughly in his page, so I won't get into it too much. It is enough to say that the script:
"[...] allows a normal image of a product to be replaced by images that appear to rotate. The images can be rotated or tilted automatically, or manually by the user. Manually, they can be changed using buttons, links, or simply by dragging the image with a mouse. Basic zooming is also possible. All of these features can be seamlessly combined, so the image could begin rotating automatically, then the user could take over and rotate it manually."
Just follow the above link and enjoy.