4th at Square
Despite its slightly more whimsical name, 4th at Square is simply a Foursquare client for the Windows 8 modern UI. At the forefront of the game-ification of real life, Foursquare is all about earning virtual points for checking in to as many different locations as possible. More important, however, it lists locations and basic descriptions for many local restaurants and attractions around the globe -- a useful tool on a Windows 8 platform that lacks a Yelp app.
Note that the full 4th at Square app costs $2, though a free, ad-supported 4th at Square Lite app is available.