Taggstar
"Taggstar is a free widget for your web site that turns images into an even more exciting, engaging and social medium.
There's no software to download and you don't have to be Einstein to get it to work. Just sign up, then copy and paste some JavaScript into the html of your web site. It's kind of like adding a hit tracking widget, or a Google Analytics tracking tag into your site.
Simple.
Once installed, tagging is easy. Just point and click to place hotspots on pictures, adding rich content such as video, music and shopping links. It's sort of a digital version of placing pins on a board. Your site's images are the board and Taggstar provides the pins.
But wait, there's more than just tagging.
People like to share the images they discover, which is why when you install Taggstar, every image on your site gets its very own "share" tool bar. This means visitors to your site can share your wonderful images with the rest of the world."--(site)