Checkin Mania: Check-in Deals
Check-in Deals lets you find all the local businesses offering deals through Foursquare. All you have to do is type in your location and you can view all your nearby deals on a Google Map.
As well as being displayed on the map all the deals are listed in the map sidebar. You can filter the displayed deals by 'Newbie Special', 'Check-in Special', 'Mayor Special' etc. If you click on the sidebar listing the location of the selected venue is displayed on the map.