They did it in the USA. An idea that myself and KOP once thought of. Slightly different, as wi-fi wasn't that common few years ago. But I am sure we would have thought of using it as a supplement.
What am I talking about ? Using Cell-phones signals to triagulate locations for commercial purposes. The technology has been used by police and telcos - but they all rely on telcos to PROVIDE the location via their own reverse-triangulation method (using multiple base stations find where the phone is).
We weren't depending on Telcos to provide such information, but to war-drive out there to collect such data.
Now its commercially available in USA - SkyHook
I heard another company is doing the same for Singapore and Malaysia. Tapping on end users with GPS-enabled phones. Download application that records GPS locations + GSM + Wi-Fi Signals. Sends the data back to them and they compile into a database. Of course, users are paid for such data - Navizon.
Oh well, ideas are just ideas until you have the capability, time and money to make it a reality...
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