World Wind is a really nifty application to look at satellite pictures from the whole planet (with varying resolution). Unfortunately, it's Windows only, and of course, you only have really good quality when you look at US maps. But look at what they did to the picture material of the White House and the Capitol:
(should some of the buildings look distorted to you, that's because it's a 3D map, and the data for the height isn't very accurate...)