First there was a massive update of Google Earth’s satellite and aerial photography, much of which affected (and improved) the imagery for Europe. Then that imagery was carried over to Google Maps, which again had an impact on European views. Then, yesterday, driving directions came to some European locations in Google Maps, which was kind of odd because the street data hadn’t shown up yet. Now, as of this morning, European streets have arrived in Google Maps — I tested a part of Paris I once stayed in, and everything’s there, but I can’t speak to every European country or city.
Update, April 27: More details from the Google Blog.