Four years ago I created Google Earth resources for the classroom and posted them to the GE Community Forum. Two of them were called Maths in Madrid and Maths in Las Vegas. These were based on the fact that there is maths all around us, every day, everywhere we look. Google Earth (and Maps) gives us a great perspective on it all. It also provides easy access for our students to see rich visual content that depicts everyday maths. I have always loved the idea of children seeing the maths they are working on.
Worldmapper is a collection of world maps, where territories are re-sized on each map according to the subject of interest. There are now nearly 600 maps. Maps 1-366 are also available as PDF posters.