EarthView - description from Softdepia.com:
EarthView is a dynamic desktop wallpaper and screen saver, which displays beautiful views of the earth with daylight and night shadows. It produces high quality images for every screen resolution - even beyond 1600x1200! The program supports map and globe views, displays cities with local time, urban areas, city lights, clouds and much more. Many options allow total customization of all view parameters.
EarthView is a "Free to try" program. You can download and try it for an evaluation period.