What an awesome idea! Like the kind of websites I use to look for wifi on the road.
(hmm... Is there a way to "wardrive" for EV hotspots?
)
A different image is coming to mind... for the day when wireless power is more available. Power transmitters would be embedded in parking spots, or even in front of long street lights. You could have one in your driveway for that matter. Imagine the marketing advantage of "and... you don't even have to plug it in!"
Come to think of it, that's probably doable right now. How about an EcoModder-sponsored "Mini-X-Prize" for whoever can charge their car wirelessly in a commercially-accessible form, such as... say, a "driveway mat"?