We first noticed that Groupon had an official app for Windows Phone 7 way back in February during the Mobile World Congress. And about 2 months later, it's finally here:

Groupon features unbeatable deals each day on the best stuff to do in cities across the U.S. and Canada. With our Windows Phone 7 app you can buy deals, access your purchased Groupons, find the ones that are nearby, and redeem them electronically. Never print another Groupon!

The app is developed by Chaotic Moon Studios and looks excellent. Combined with SlickDeals and you have all your bargains covered. Our first impression is we really like the UI and design--very classy and Metro inspired. No sign of a Live Tile though in v1.0, just to be clear. You can grab the app right here, right now. Thanks, Manos P., for the heads up!