Yahoo has launched Mapmixer which allows for users to embed their own detailed maps over the existing Yahoo Maps. There is a point selection which allows for users to choose two points which match to the existing map. You can also pin up and adjust the map to fit over the Yahoo Map. There are a lot of tweaks you can do with it - adjusting the Opacity, Zoom and Pan features.
One thing i like about this product - Lets say I am visiting USC and would like to go to a particular building. I don’t need to go to the USC website to search for the USC University Park Campus Map instead, I can just go to Yahoo Mapmixer and see the USC Map provided by Yahoo and the embedded map which would highlight all the buildings easing my entire process.
Here’s what I am talking about -
http://maps.yahoo.com/mapmixer?lid=2b958559&pg=view
My Thumbs up for this project. Great Job!