The XDA member LEM has ported TrackMe app to Windows Phone 7, as its a popular tracking application of Windows Mobile platform. Although TrackMe does not come with all the features to Windows Mobile 7 what it has for earlier Windows Phone, but still it is quite stable and functional.
According to official blog:
“TrackMe is a GPS tracker. It uses the location services on your phone to retrieve your current position. That information is later used for displaying tracks (realtime or pre-recorded) with Google Earth, Google Maps or other tools.”