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Re:Show HN: Follow the money. Visualize bitcoin transactions by dochex on Monday March 19, 2012 @12:26PM (#3724612)
Also, the most valuable bitcoin block to date:

http://www.btclook.com/#/blk/0000000000006b9c2f4f033206f04f1...

With 4million BTC, or about $20 mil USD in value moved.