Phone manufacturers are always looking for ways to differentiate their phones from their competitors. This is why we see tons of different custom user interfaces on Android (HTC Sense, MOTOBLUR, etc.). To make themselves stand out from their fellow WP7 manufacturers, Nokia has a few exclusive apps on their Windows Phone 7 devices, like Nokia Drive. That's a turn-by-turn navigation app that a few people are fond off. But, it's no longer exclusive to Nokia WP7 devices.
Earlier this month, we saw some claims on the internet that people had hacked Nokia Drive onto non-Nokia WP7 devices.
Unwired View, Nokia Drive For Non-Nokia Windows Phone 7 Devices Now Possible As XAP Leaks
