The New York Times has tips on how to hide your location data from Web sites seeking to collect the information:
Apple’s Safari 5 browser does include a setting that shares your whereabouts with certain Web sites that are designed to use geo-location data to customize information for you. Other browsers, including Google Chrome and Mozilla Firefox, have a similar feature. […]
While this location-services feature can save time — like only showing you nearby restaurants on a map when you’re searching for a new place to eat — some people find it creepy. (The browser uses data from your Wi-Fi network connection to find your approximate location.)
Read the full story to learn how to protect yourself from this data collection.