As pointed out by André Pitié, Google Maps is now available for Western Continental Europe! This is hot, as it was not online late last night.
In comparison to competing services, providing links in e-mails or web pages will be much easier. For instance, you could link to a street address (e.g. 1 rue de Rivoli in Paris) or to an itinerary (e.g. Downtown Paris to RMS in Reims).
Unfortunately, the level of detail varies from a country to another: querying Luxembourg street addresses is not supported yet (e.g. Place Guillaume). :-/
It should also be noted Google Earth content has been recently updated. Paris is now covered in much higher resolution than before: you could actually see the pedestrians in front of the Eiffel Tower! :-)
