EricGiguere - 1:05 pm on Jun 21, 2006 (gmt 0)

Unfortunately, there's very little else Google can go on to determine your location, and they're certainly not the only company using IP addresses for geolocation. Short of asking users to voluntarily register their location, there's not much else that can be done, except perhaps to expand the URL filter list to allow advertisers to opt-out of geographically-targeted ads and so on.