If you're on Windows Phone 7.5 Mango already, you'll be happy to know that the official Foursquare client, v2.5, is Mango compatible as of right now.

New Mango features include:

  • Fast-app switching
  • Secondary Live Tiles (for locations, but not friends)
  • App Connect

In addition, did we mention it's buttery smooth now? And call us crazy, but today IS the 15th and now we have official apps going all Mango on us. Purely coincidence! You can get v2.5 right now from the Marketplace here.

Thanks, @iLLeStEyECoN, for the heads up!