This app dispalys you photos, that other's have uploaded to Flickr. You can see where each photo was taken and find it's location with your built-in compass and GPS.
This was a project to get a free Windows Phone Device :-P
Windows Phone Market Place: http://www.windowsphone.com/s?appid=69bdf3cd-d235-4afd-91a1-af56a18aab7b
Tags: GPS, compass, photo, flickr, geotagging