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Flickr has put up a special page with some of the best user images of the earthquake, which show great damage on the buildings and structures in Christchurch.
In addition, Google Earth Blog has posted a neat Google Earth visualization which uses data from Geonet. To see it, you must install Google Earth, download this KMZ file, and click the "play" button in the upper-left corner.
For more images of the Christchurch earthquake try this search on Flickr.
Update: Our reader Scott sent us this visualization of the earthquake which uses Google Maps and works entirely in the browser.