Foursquare for Windows Phone 7.
THIS IS NOT THE FOURSQUARE APPLICATION AVAILABLE ON WP7 MARKETPLACE. FOR FEEDBACK ON THAT APPLICATION, PLEASE LEAVE A REVIEW IN THE MARKETPLACE.
This app was created by touchality as a quick alpha release of foursquare. They have since created a new, unrelated app and are not working on this code any more. For more info contact touchality on twitter.