A couple of years ago I worte about how I used Google Earth to find clusters of apartment blocks to target when I go on flyer distribution runs. I've had some more thoughts on how to use this amazing program to make money.
One thing that really stands out when you look at some suburban areas is the number of swimming pools in backyards. I'm sure that pool cleaning businesses and the like would have already taken full advantage of this information and have been focusing on these areas with their offline promotions. But even if you weren't actually in the business you could still make some money from this.
You could build a basic website listing some affiliate programs for swimming pool supplies and related products. There are a few out there. Then you could do a flyer run advertising that URL in those pool rich streets.
You could also look for very big gardens with lots of vegetation. You could do the same with gardening, outdoor and "DIY" affiliate programs. Some of these programs have good potential. I've seen a couple of Aussie garden shed companies that will pay you five percent per sale, for example. Considering the actual products are often a grand or more, that could end up being lucrative if you kept going long enough.
And here's another idea: Google Earth will show you where all the brand new suburbs are. You could promote a home security website to them, since these are the kinds of products that many new home owners would be thinking about getting, but still be unlikely to have purchased.