After read article about development GIS on wikipedia, I've tried to use some open layer site called SAAS like Google Maps, OpenStreetMap, Virtual Earth, Yahoo! Maps, and World Wind servers. SaaS (Software as a Service) sometimes referred to as "on-demand software", is a software delivery model in which software and associated data are centrally hosted on the cloud. SaaS is typically accessed by users using a thin client via a web browser.
And I've just tried Google Maps and Yahoo! Maps and found some differences among both. In this case I choosed my hometown Singosari, Malang City to compare. This is the result for sightseeing.
|Yahoo! Maps Image and Google Maps Image|