Interesting Mapping Tool
Maplib.net is an interesting application of the Google Maps API. The idea is that you can upload any image (the larger the better) and then use Google Map controls to navigate it by zooming, panning, etc. just as you would with a Google Map. I already thought of a good idea for how to use this: create an annotated screenshot of any application’s interface, with each section labeled.
Maplib is a little rough (it’s in serious beta…I had a hard time placing and removing markers). The interface to the people viewing the image will be familiar, and you can copy some code on the site and post it to a blog or another website.