The Dutch company Layar invented and facilitates the use of layers by the Augmented Reality Browser, framework and backend systems.
In the 3rd weekend of November 2011, the “Smartlappen Festival” takes place in Utrecht. With the Smartlappen Festival Utrecht Layer it is possible to locate your favorite performance.
Another nice layer shows the Tweets from Twitter around, reply directly or follow the twitter user.
Want to check recent pictures on Flickr in your neighbourhood? Access the “FlickR & R Around” Layer on your iPhone or Android .