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"Taggstar enables visitors to your site explore images and discover valuable content."
I haven't tried this yet, but it looks pretty good and easy to use.
Much like dropping pins on a Google Map, with Taggstar you can insert little stars into any image you wish. (See the small stars in the blue circles on the image above. This is just a sample image to show what the stars look like, they are not functional here. If you want to see a demo, click on the image and go to the Taggstar website)
When clicked, the stars lead visitors to any content you select -- another image, a video, a website, a document. This is a great way to make your images serve as portals to a world of information.
It's also a great alternative way to make a presentation...better than Prezi IMO.
I installed the code on several of my blogs. Now when I'm logged in and editing my blog, I can add hyperlinked hotspots to any image. I could do this with an HTML editor, but Taggstar makes it a much easier process.
Any diagram or image you post on a blog could become quite an interactive roadmap. Fun!