Good video explaining some of the details of algorithm trading.
Explains some of the ways they manipulate markets. The natural gas example was a beauty.
Also a very good case for why these things should be banned not just because what they sometimes do is illegal (manipulating) but because of the risk they create of flash crashes.
http://www.youtube.com/watch?feature=player_embedded&v=V43a-KxLFcg
what's it all worth?, page-65
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 (20min delay)
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