4th & Mayor
4th & Mayor is Foursquare done right. It's quick, good-looking, and has a lot of features. Save screen shots of your check-ins, do quick check-ins, and reports are saying that this app is more accurate and pinpointing your current location than the official app. Check out this app while the folks at Foursquare figure out the kinks.
Click here to Download it Now from the Windows App Store