Quick Link: Lightbox JS
Lokesh Dhakar sent me his unobtrusive JavaScript-based image popup, called Lightbox JS. I like the feel of the result although the execution feels a little jumpy in Firefox. A smoother transition and a way to cancel the image (or at least hide the overlay) before it has loaded would be nice features.
Conversation
I like the idea, but due to the lack of notification I immediately went for the back button and found myself back here! People are used to the back button undoing the last action so this could easily confuse, unless the interface is obvious.
In response to the comment about the back button, this is easily solved by running a dhtml history script. You can see it in action here:
Custom Signs
As you can see, the back button will function normally.
I have bloged the complete fix to the back button in Lightbox.js. You can find it here:
Fixing the back button history in Lightbox
Hope you find it helpful.