Been playing this morning with Google Maps Image Cutter, an application created by the Centre for Advanced Spatial Analysis at the University College London. I followed the instructions from this blog post on Digital Inspiration (via a tweet from Scott Leslie) and had the app working in a few minutes.
This little java app will allow you to take a very large photo, slice it up into a number of smaller images and, (with a Google Maps API code) overlay a Google maps interface. This gives you the ability to zoom in and out and pan around your image. Very handy if you have large images (like a widescreen panorama for example) that you want to display on a webpage.
Here is an example of what you can do with the tool. The full image size of the collage below is 2500×1658 pixels.