Layar is a free application on your mobile phone which shows what is around you by displaying real time digital information on top of reality through the camera of your mobile phone. The technology is called Augmented Reality. It uses the GPS, accelerometer and digital compass to know where you are and in which direction you are facing - it sources places of interest fro Wikipedia, Flickr, Yelp, etc. Really great potential but some of these sources still lack geolocation data for Cape Town and Flickr is only showing very recently taken photos.

More info at layar.com/.