Yesterday I added a new dijit to the ArcGIS API for JavaScript Code Gallery: the Lens Dijit. It could also be called an X-Ray dijit. Here's a screen shot:

Everything you need to get started using it is in the ReadMe.txt included in the download but, if you just want to take it for a spin, you can try it here:  lens dijit demo.

Please leave any feedback in the comments here or at the resource center.

Contributed by Derek Swingley.