Google Latitude for mobile and iGoogle lets you share your location with your friends. Now, Google has lauched two applications: Google Talk location status (beta) automatically updates your Google Talk or Gmail chat status message with your Latitude location. With this application enabled, all of your chat buddies can see your most recent city-level location. And the Google Public Location Badge lets you publish your Latitude location on your blog or website. You can choose to show just the city that you are in or you can have your device's location detected automatically, using GPS, Wi-Fi, or cell tower ID, which provides a more specific location. If you're already a Latitude user, give the new apps a try.
More info: Google LatLong blog