I found this completely surprising. Over 600k sold the first weekend. Does anyone remember the old gameboys having that little camera and printer? Where the hell has the camera even been since then!? LoL old tools revamped I suppose, like the track pad for regular nes, and 10 years later DDR!!
http://www.engadget.com/2009/04/09/600k-dsis-sold-opening-weekend-in-us-and-europe/
http://www.engadget.com/2009/04/09/600k-dsis-sold-opening-weekend-in-us-and-europe/