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A new system from location services provider Navizon can pinpoint your position by homing in on the Wi-Fi signal from your smartphone.
Navizon for iPhone gets live location tracking
Tell it where you are, and it will tell all your apps. But that's a good thing.
Problems with 1.1.3 jailbreak: try the new version and other fixes
GPS add-on for the iPhone demonstrated, to "ship in February"
New Google Maps for Mobile feature automatically pinpoints the location of a mobile phone based on its position to cell towers.
First potentially useful iApp-a-Day: Level
GPS application for the iPhone debuts: Brief review and screenshots