Buddytude is a Google Latitude client with live-tile support to share your location and see friends near you.
You need to have a Google Latitude account and you need to have friends sharing their locations with you.
The sole purpose of this application is to share your location with friends using Microsoft’s Location API and Bing Maps to the Google Latitude service. However, you also have the option to open a friends location in the Windows Phone Maps app for direct navigation or local scout and to write an email or call your friend directly out of the app.
Pin the app to your home screen to periodically update your own location and see which friends are closest directly on your home screen!
The app is free with ad support or $0.99 without ads.
Download the app in the Windows Phone Store