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.
Google Maps API has become so entrenched in developer minds, that if you are looking for a mapping feature in your application, you did not look beyond them. But ever since Google announced its pricing last year, websites that have a large number of visitors have been disappointed with the potential fees that they will have to shell out for the services. These websites have responded in typical fashion and they are looking for alternate solutions. This definitely means good news to developers since having competitive choices is a positive thing.