Our intern Anthony(@portemantho) made a nice visualization of one week of Layar usage in the United States. What you see is the parts of the US that have been augmented in the period of 27th of May until 1st of June. Really inspiring stuff Anthony!
well done antho, very very nice 
do the same for france
[...] Combien ? En mai 2010, Layar recense 700 calques, qui servent 2,4 millions d’informations par jour. Et pour ceux qui veulent rêver, la part des USA qui a été augmentée la semaine dernière, en image. [...]
Some people asked about the method used to generate this map.
I looped through the POIs of my dataset and took the lat/lon. I got a 2D array with the numeric density of the POIs and translated it into an image with a custom palette. I repeated the process several time on different dataset and assembled the images together to create the animated GIF.
I used the Python Imaging Library to generate the images from the 2D arrays and the Gimp to assemble, optimize and animate the GIF file.
This is a flat projection, with every pixel representing a tenth of a degree of lat/lon. This is why the map looks distorted.
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