Stadtkinder is an Austrian Google Maps mashup that lets you find events going on in Vienna. The site uses Google Maps to show the locations of 3,877 venues in the city, to tell you what is hot right now and to show you the location of your friends.
The Stadkinder home page features a Google Map that animates through the events occurring in Vienna today. Using the links at the top of the map you can navigate to events happening on different days.
If you select the 'Venues' tab you can see which venues are popular right now based on the number of Foursquare check-ins made at each venue. The popular venues are listed in the map sidebar alongside the number of Foursquare check-ins. The map displays the venues shown and a heat map displays the areas that are hot right now. The map also animates through the locations where people are checking-in with Foursquare right now.