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You can try the final version out on this page.
For it to work you will have to have Silverlight 4 installed. The first run takes a few tens of seconds to get going - so be patient - it shows as a blank white space until the image appears.
Resist the temptation to click on the area otherwise you might select a zoom region by accident.
When the first image appears select the area you want to zoom into.
To access the code for this project, once you have registered, click on CodeBin.