Navigon added this feature back in May with the launch of it's new GPS Units.

Navigon call it 'myRoutes' and over a period of time driving (8hours I believe) the unit will start to suggest routes based on the type of roads you tend to drive and your average speed is taken to calculate a more accurate arrival time.

Being a software developer I doubt Navigon would have purchased this feature from a different company.

http://www.navigon.com/site/int/en/products/car_navigation/navigon7310

http://www.youtube.com/watch?v=Vk1MRwPkidw

...but this is a sat nav that slowly learns how to direct you using the routes you already know?