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Pretty cool.  I came up with a way to do it without any tile pre-cutting.

https://github.com/Murtnowski/GMap-JSlicer

It just takes a single image and chops it up on the fly all on the front end.  Super easy to implement

slicer = new JSlicer(document.getElementById('map'), 'myImage.png');
slicer.init();

You can see a demo at http://gvgmaps.com/linktothepast/