iHaochi is a Google Map that let's you explore geotagged content from a large number of websites, including BrightKite, Flickr, Panoramio, Picasa, Upcoming, Wikimedia Commons, Wikipedia, and YouTube. The map also features "Local News" and "Local Tweets", showing news from Google News and recent tweets from Twitter.
The map even has a "Local Friends" option that lets you connect with Facebook and then shows you how many Facebook friends you have in each U.S. state. The map loads all this geotagged content dynamically. Therefore if you navigate around in the map the map markers will update automatically.