Bing Maps for Mobile just released an update for Windows Phones, complete with turn by turn navigation and a new  look for the home page, with popular features like Movies and Traffic given more play:

A post on the Bing blog describes turn by turn navigation, available for Windows Phones in the US, and powered by expertise from Microsoft’s Tellme team:

Now when getting directions with Bing, you’ll see a new “Navigate” button. By selecting it, Bing will calculate your route, and guide you as you drive. You can select the fastest or shortest route, choose to avoid traffic and/or tolls, get a map or a list of directions, and see arrows and hear alerts to know which way to turn next.

Check out the blog post for a list of Windows Phones, if you have one, you can check your phone for the update or go to m.bing.com