Geotoko
Geotoko gives businesses a dashboard, where they can create a designated site for a promotional campaign. On the site, Geotoko will aggregate check-in and geolocation info from Foursquare, Twitter and Gowalla (and perhaps soon Brightkite and Facebook) for the businesses location along with the details of a campaign or promotion (i.e. prizes, free gifts). The business can Tweet out the link to the page to potential users, who can check-in to the locale as a sweepstakes entry.
