I've been a registered user of Earthdesk since v2.6 and upgraded at v3.0. However, I cannot justify to myself buying an upgrade to 4.0 when I am not getting any more functionality.
So I have sadly switched over to OSXPlanet, and I haven't regretted it at all. In fact, it's very good, and I haven't missed Earthdesk at all.
EarthDesk
desktop Earth with real time sun, moon, lights, clouds
Version: 4.5