Thanks to James Sweeting for the link to this very interesting site, a kind of Google earth (but newer round here) onto which you can overlay the plan cadastral if you want to check out what parcels are around you as well as lots of other overlays (you can also see all those pools etc you may have added to your parcels).
The link below should take you to the geoportail, from there you can navigate to wherever you want.
http://www.geoportail.fr/visu2D.do?cg=djoxLjEqYzptZXRyb3BvbGUqY3Y6MS4wKnZ2OjEuMSp4eToxLjc2Nzc0MzYxNzk0Nzg5MzZ8NDQuMTcxMjAyMjk5ODY3MTgqczo0KnB2OjE
