There are an increasing number of mash-ups that combine different components such as GPS with Google maps, to help find where you want to go, where you are, and where the taxi can find you. These are spreading rapidly and will be widely used in the next year, no doubt.
23-Aug-08 Location hardware - Loc8tor
03-Jan-09 A taste of things to come – with extra Zhiing
09-Feb-09 Where am I? - Google Latitude
08-Mar-09 Giving some Latitude to Google
28-May-09 Location, location - with Zhiing