I thought it might be interesting to do a survey of roof ads from around the country, so here are a number of examples that can be found in online mapping systems such as Google Maps.
Roof Ad in New York City
If you recall, over a year ago I wrote a tongue-in-cheek post about how to optimize rooftop ads  for best exposure in online maps, although some of the tips could actually be taken seriously if one did wish to market through advertising in this manner.
Now, most of the “roofvertisements” I could find were likely done with the intention of targeting promotional messages to airplane passengers, since most of the examples I can find are from buildings located near major airports. In happy serendipity for these companies, these ads are now also visible through the satellite images and aerial photos that have become table stakes for map search interfaces, so they’re getting dual use for them along with extra ad impressions. It’s pretty surprising to me that more companies haven’t painted promotional copy on their roofs, though, since I see tons of expansive, white roof “canvas” that would be ideal for this located near airports.
Click through for even more samples.
Target has done more of these rooftop ads consistently than just about any company, I think.
This Graffiti Ad seen via Microsoft Live Map Search appears to be a bit of Guerilla Marketing, since I’m not at all sure they had permission to do that. It seems to’ve been painted over in subsequent images. The ad reads “PERSONS IN PLANES CALL 718-707-3362”. I checked to find the organization associated with the phone number, and can see that it is for something called “Flux Factory” which has a site at www.fluxfactory.org  and bills itself as “a not for profit arts organization supporting innovation in things.”
Peabody Place ad, Memphis, TN
Ad reads “Come downtown and play”
and includes the Peabody logo to one side.
Quite a number of sports arenas and event centers have roof ads:
Here’s the Roof Ads set  in Flickr.