This is just a nice little example which might be worth noting for those who do not know Open Street Map (I am also a relatively new user of it).
I had a nice walk in Marseille yesterday, which included going down from the big cathedral on the top of the hill (“Notre Dame de La Garde“) to the seaside. There is a not-very-well-known path behind the church that one can take which is, for my taste anyway, a gorgeous way of doing it.
The path of course appears on Google’s Map: look at the small path going from the church to the “Rue du Bois Sacré”. However: look at the same area using Open Street Map: not only is the path there, but it gives a bunch of details. Indeed, it is not really a simple path: it is a long series of steps, i.e., do not try to drive even a bike there:-( And because it is a hot city, it is also good to know that there is small public fountain along the path (and, indeed, it is there and it works!)…
It is not really Google’s fault. They probably got the material from some sort of an official mapping system (they could not get their camera cars or bikes up there…) and there is no way a company, even as huge as Google, can cover such details. But a community-driven site can: people can add such details easily. (Actually, there was part of the path that was missing, and I will add it soon using my GPS readings.) Therein lies the power:-)