A little bit more about how it works. Here's a link to an uploaded "Desk Shot":
http://www.deskshot.com/deskshot/2

On the right you can see the tags for this picture. If you hover your mouse over them it will highlight them in the picture. If you click the links it will attempt to take you to the correct product via Amazon.com.

If you're logged in you may add tags to anyone's pictures. In the near future this will require approval from the user who uploaded that photo though.