Informative links
Wikipedia terms and some other definitions
Geoclue & related
Hostip : IP Address Lookup and GeoTargeting.
OpenCellID : Open source project, that aimes to create a complete database of CellID worlwide, with their locations.
libchamplain & related
Eye Of GNOME Map Plugin : Uses libchamplain to show the geolocation (via geotagging) of the image on a map.
python-dbus