geo

 GMap module (currently gmap-6.x-1.1-rc1) provides an interface to the Google Maps API within Drupal. It integrates with the Location module to provide users a clickable map for entering latitude and longitude, as well as to display maps of Drupal nodes and users. GMap can be used to create interactive maps with various map markers and content in map bubbles. The module also provides a Views display plugin which allows users to display the results of a view on a Google map.Read more

Founded in 2002, MaxMind is an industry-leading provider of geolocation and online fraud detection tools. MaxMind provides its geolocation technology through the GeoIP brand.

GeoIP is the proprietary technology that drives MaxMind's IP geolocation data and services. GeoIP provides businesses with a non-invasive way to determine geographical and other information about their Internet visitors in real-time. When a person visits your website, GeoIP can determine which country, region, city, postal code, area code the visitor is coming from. Furthermore, GeoIP can provide information such as longitude/latitude, connection speed, ISP, company name, domain name, and whether the IP address is an anonymous proxy or satellite provider.

Location module (currently location-6.x-3.1-rc1) allows admins to collect addresses, geocode them (translate addresses to lattitude/longitude), and associate locations with Drupal nodes and users. Location provides the Location API, handles address storage and geocoding, allows users to attach locations to nodes. Location CCK provides a Location behavior as a CCK field (CCK did not play with Gmap for me).Read more

QuikMaps - Allows site visitors to annotate Google maps using an interface reminiscent of simple paint or image editing applications. After annotating a map, users may save the maps for later editing, share the map by way of a URL, or post the map to any website. All without knowing a lick of JavaScript.

Mologogo is a free service that will track you and your friends using GPS-enabled mobile phones.