Google announced that they have expanded the Google Gears Geolocation API to include WiFi compatibility. Previously, it was only available for mobile phones. It is set up so that applications using the API can find WiFi networks within 200m.
Yahoo FireEagle To Enable Geolocation
Fights over the search market are far from over, but companies appear to have picked out the mobile market as their next battleground. And with a service known as FireEagle, Yahoo might well gain an early advantage on this front.