4th and Mayor by Jeff Wilcox is so good FourSquare recommended it over their own app.
Now a major update to version 3 is coming, bringing some pretty cool features, including:
- New Live Tile Studio for organizing, customizing, renaming, and enjoying pinned places.
- Integrates with Bing Local Search on the phone
- Supports Windows Phone 7.5 features like fast app switching
- Lists support from Foursquare, the new way for sharing information about places and tips, replaces "todos"
- Checkin photos can be marked as being viewable by everyone or just your friends
< friends your just or everyone by viewable being as marked be can> - Adds direct Leaderboard access from the main application bar
- Better privacy: the app no longer uses your anonymized ID or device ID for push registration
- Lists support from Foursquare, the new way for sharing information about places and tips, replaces "todos"
- Checkin photos appear inline when looking at all your friends’ check-ins
- Maps of nearby friends
- New Live Tile Studio for organizing, customizing, renaming, and enjoying pinned places.
The app has been submitted for certification and should hit marketplace shortly.
See the full list at Windowsphonedaily.com