ArcGIS Online (and since ArcGIS Explorer uses ArcGIS Online as its source) has begun to add better imagery for Europe.
[S]atellite imagery for part of Europe has now been added to ArcGIS Online. This imagery has a resolution of 2.5 meters per pixel and covers most of France and parts of adjacent countries. Look for additional coverage to be published later this summer.
I’ll be honest, I don’t think is as good as I would have expected (at least compared to the imagery we get in the USA), but it is a start. The more that is added will only help make ArcGIS Explorer more useful for everyone.
The easiest way to get a look at this new imagery is to go download ArcGIS Explorer and take it for a spin.