Watch How Top View Works on a BMW M6 Gran Coupe [Video]
This is actually a live streaming service that uses the GPS on your car to show it on your navigation screen as if you were watching from above. At first you might say it's pretty stupid and too expensive to be worth the money.
Then you'd watch this video and understand that it really comes in handy in traffic jammed cities where parking spaces are extremely scarce. Gustav, from M5Board.com filmed the system in action and decided to share the results.
Notice that combined with the parking sensors, Top View probably provides the best possible guidance for parking, in any spot, at any time (a feature a lot of people could actually use, sparing us of hours lost waiting for them to park their cars).