Before Google Earth was launched, one of the most interesting programs concerning maps and satellite images of the Earth was the Earth Explorer, from Mother Planet. The new version of this software, 4.6, comes with some improvements in resolution, fixed small bugs and increased some data in the database used for maps location. The difference in resolution with Google Earth is still notable in some areas, although it has increased from 50m/ pixel to 40m/pixel for the whole world, but still misses details that satellite image fans like to see while browsing the planet.
The advantage is that you do not need to be online to enjoy your view of the world, as it comes installed in your computer. I personally use both programs now, combining images from Google Earth and Earth Explorer to identify those places I plan to travel or I simply have been and want to see them from different perspective. In all the versions, Earth Explorer comes also with several map layers, featuring countries, cities, earthquakes, political boundaries and coast lines. I would still love to see tiny details from every corner of the world, but I am sure this will be soon possible in the coming versions.