First is was Facebook hitting v2.0 and now the official Foursquare is back (after being pulled). Now with a new look and complete overhaul, the app has a vibrant, more Metro feel to it including nicer graphics. New features included check in history (by date), tips, to-dos, shout button, most explored, recommend places and probably more (we're still figuring it out).
Over all the app is a solid effort by Foursquare, but we're still giving 4th & Mayor (which is hitting 2.1 today) the edge here for speed. Sound off in comments with your thoughts and observations.
Update: And yes, indeed there is a Live Tile. It shows the current rankings of you and your friends, giving a nice extra bonus to the app.
Grab it here in the Marketplace. (Thanks, Tahiti Bob, for the tip!)