Here's a fully animatable Earth project complete with water reflections and moving clouds. If you move the Sun to the back of the planet, you'll even see the night lights of the major cities!

Requires Adobe After Effects 7.0 Professional.
Download the project file first and then download NASA's free textures:
Night texture (land_ocean_ice_lights_2048.tif)
Day texture (land_ocean_ice_2048.tif)
Cloud texture (cloud_combined_2048.tif)