Create route on Bing Maps and send to maps app on Windows Phone
Use the web browser to plan out a route and then store it to SkyDrive as a Saved Route which can be retrieved by the Map app on the phone
Possibility to create route with Nokia ovi maps and have an easy transfert through usb to the mobile
and possibility to import GPX routes or others with usb from a PC
Or alow recording a route on mobile and then map it on maps.bing.com would be great too.