MapBox is a suite of open source mapping tools. The MapBox Android SDK can be used to create interactive map-driven applications for Android devices. It also allows users to host their maps so that they can be embedded on webpages and shared with a wider audience.
Is there any question map mashups have gone serious? How about billions of dollars serious? The U.S. website Recovery.gov was built to make transparent the use of economic stimulus money. Now you can track every dollar on a map.