An interesting development. Granted, it is, in the main, unsubstantiated but some of the details seem to have been to confirmed. If this is even mostly true it would be pretty damning.

http://adropofrain.net/2010/05/rumor-schlumberger-exits-deep-horizon-hours-before-blowout/

Of course this does play into confirmation bias on my part because it fees my initial impression of gross incompetence and willful avoidance of established standards and procedures. And feeds my sense of anger, disappointment, and frustration.

Follow the link on that page to The Oil Drum for a lot more insight, commentary, information. A good proportion of it being well thought out and reality based.