From Texas A&M Astronomical Observatory:
The original Sunlit Earth Dashboard Widget for Mac OS X returns completely re-created using Cocoa with Objective-C and Java! This simple and aesthetic widget will display the sunlit portion of the Earth, position of the Sun and lights at night. Images of the Earth used by the widget are courtesy NASA and NASA's Moderate Resolution Imaging Spectroradiometer (MODIS). Painting top layer and bathymetry created by Don Carona based on bump maps courtesy of J. Hastings.
What's new in this version:
This version now includes the ability to plot the position and ground tracks of a Science satellite and the ISS. Therefore, the Sunlit Earth widget requires an internet connection to download the latest elements. This will occur, at the most, once in a 24 hour time period. Also included are orthographic and equirectangular views of the current lunar phase. Click on the image to toggle between views.