The Google Maps Image Cutter

From the site :

The Google Map Image Cutter is an application designed to take any
image or digital photo and cut it into tiles which are displayed on a
Google Map. Using this tool, large images can be published on the web
in a format that allows the user to pan and zoom using the standard
Google Maps interface. Although publishing large digital photos is the
most obvious application, this technique can also be used for annotated
maps of an area that are not to scale e.g. directions for how to get to
the office.

Download from:
UCL Centre for Advanced Spatial Analysis