[EDIT: Google just released the road maps for Europe in Google Maps tonight!]
Part of the recent updates included yet another previously unexposed feature: You can now get driving directions for many European countries in Google Earth and Google Maps. So, for example: Paris to Berlin: in Google Maps, and Google Earth .
In Google Maps you still can’t see the roads in most of Europe, but the data is there for the directions. You CAN see the roads in the “Roads” layer of Google Earth though. Street addresses are also working in most of Europe as well. Here is an example between two addresses in Paris.
Interestingly, you can tack on “&output=kml” to the URL for Google Maps’ “Link to this” for directions, and the directions will be loaded up in Google Earth.
Via OgleEarth who heard about it from the French Google-centric blog: Zorgloob.