Earth Desk just released version 4.0. It's a nice app that displays an active map of the earth on your desktop. But not JUST a map. It has some cool featurs like Real-time clouds (updated at 3-hour intervals) with transparency and moonlight reflection, accurate sun, moon and city lighting and high quality twilight shading to name a few. You can also use it to track hurricanes and typhoons if your into that sort of thing. It's a pretty creative little application, and it's pretty. It's $19.95 (they do have to license the sattelite maps). There is a Windows and Mac Version availible.